The colour of sky 天空的颜色
<p><span word="If">If</span> <span word="we">we</span> <span word="look">look</span> <span word="at">at</span> <span word="the">the</span> <span word="sky">sky</span> <span word="on">on</span> <span word="a">a</span> <span word="perfectly">perfectly</span> <span word="fine">fine</span> <span word="summer">summer</span>&<span word="lsquo">lsquo</span>;<span word="s">s</span> <span word="day">day</span> <span word="we">we</span> <span word="shall">shall</span> <span word="find">find</span> <span word="that">that</span> <span word="theblue">theblue</span> <span word="colour">colour</span> <span word="is">is</span> <span word="the">the</span> <span word="most">most</span> <span word="pure">pure</span> <span word="and">and</span> <span word="intense">intense</span> <span word="overhead">overhead</span>，<span word="and">and</span> <span word="when">when</span> <span word="looking">looking</span> <span word="high">high</span> <span word="up">up</span> <span word="in">in</span> <span word="adirection">adirection</span> <span word="opposite">opposite</span> <span word="to">to</span> <span word="the">the</span> <span word="sun">sun</span>. <span word="Near">Near</span> <span word="the">the</span> <span word="horizon">horizon</span> <span word="it">it</span> <span word="is">is</span> <span word="always">always</span> <span word="less">less</span> <span word="bright">bright</span>，<span word="whilein">whilein</span> <span word="the">the</span> <span word="region">region</span> <span word="immediately">immediately</span> <span word="around">around</span> <span word="the">the</span> <span word="sun">sun</span> <span word="it">it</span> <span word="is">is</span> <span word="more">more</span> <span word="or">or</span> <span word="less">less</span> <span word="yellow">yellow</span>. <span word="The">The</span> <span word="reasonof">reasonof</span> <span word="this">this</span> <span word="is">is</span> <span word="that">that</span> <span word="near">near</span> <span word="the">the</span> <span word="horizon">horizon</span> <span word="we">we</span> <span word="look">look</span> <span word="through">through</span> <span word="a">a</span> <span word="very">very</span> <span word="great">great</span> <span word="thickness">thickness</span> <span word="of">of</span> <span word="thelower">thelower</span> <span word="atmosphere">atmosphere</span>，<span word="which">which</span> <span word="is">is</span> <span word="full">full</span> <span word="of">of</span> <span word="the">the</span> <span word="larger">larger</span> <span word="dust">dust</span> <span word="particles">particles</span> <span word="reflecting">reflecting</span> <span word="whitelight">whitelight</span>，<span word="and">and</span> <span word="this">this</span> <span word="diluter">diluter</span> <span word="the">the</span> <span word="pure">pure</span> <span word="blue">blue</span> <span word="of">of</span> <span word="the">the</span> <span word="higher">higher</span> <span word="atmosphere">atmosphere</span> <span word="seen">seen</span> <span word="beyond">beyond</span>，<span word="And">And</span> <span word="inthe">inthe</span> <span word="vicinity">vicinity</span> <span word="of">of</span> <span word="the">the</span> <span word="sun">sun</span> <span word="a">a</span> <span word="good">good</span> <span word="deal">deal</span> <span word="of">of</span> <span word="the">the</span> <span word="blue">blue</span> <span word="light">light</span> <span word="is">is</span> <span word="reflected">reflected</span> <span word="back">back</span> <span word="intospace">intospace</span> <span word="by">by</span> <span word="the">the</span> <span word="finer">finer</span> <span word="dust">dust</span>，<span word="thus">thus</span> <span word="giving">giving</span> <span word="a">a</span> <span word="yellowish">yellowish</span> <span word="tinge">tinge</span> <span word="to">to</span> <span word="that">that</span> <span word="which">which</span> <span word="reaches">reaches</span> <span word="usreflected">usreflected</span> <span word="chiefly">chiefly</span> <span word="from">from</span> <span word="the">the</span> <span word="coarse">coarse</span> <span word="dust">dust</span> <span word="of">of</span> <span word="the">the</span> <span word="lower">lower</span> <span word="atmosphere">atmosphere</span>. <span word="At">At</span> <span word="sunset">sunset</span> <span word="andsunrise">andsunrise</span>，<span word="however">however</span>，<span word="this">this</span> <span word="last">last</span> <span word="effect">effect</span> <span word="is">is</span> <span word="greatly">greatly</span> <span word="intensified">intensified</span>，<span word="owing">owing</span> <span word="to">to</span> <span word="the">the</span> <span word="greatthickness">greatthickness</span> <span word="of">of</span> <span word="the">the</span> <span word="strata">strata</span> <span word="of">of</span> <span word="air">air</span> <span word="through">through</span> <span word="which">which</span> <span word="the">the</span> <span word="light">light</span> <span word="reaches">reaches</span> <span word="us">us</span>. <span word="The">The</span> <span word="enormousamount">enormousamount</span> <span word="of">of</span> <span word="this">this</span> <span word="dust">dust</span> <span word="is">is</span> <span word="well">well</span> <span word="shown">shown</span> <span word="by">by</span> <span word="the">the</span> <span word="fact">fact</span> <span word="that">that</span> <span word="then">then</span> <span word="only">only</span> <span word="we">we</span> <span word="can">can</span> <span word="look">look</span> <span word="full">full</span> <span word="atthe">atthe</span> <span word="sun">sun</span>，<span word="even">even</span> <span word="when">when</span> <span word="the">the</span> <span word="whole">whole</span> <span word="sky">sky</span> <span word="is">is</span> <span word="free">free</span> <span word="from">from</span> <span word="clouds">clouds</span> <span word="and">and</span> <span word="there">there</span> <span word="is">is</span> <span word="no">no</span> <span word="apparentmist">apparentmist</span>.</p><p><span word="But">But</span> <span word="the">the</span> <span word="sun">sun</span>&<span word="rsquo">rsquo</span>;<span word="s">s</span> <span word="rays">rays</span> <span word="then">then</span> <span word="reach">reach</span> <span word="us">us</span> <span word="after">after</span> <span word="having">having</span> <span word="passed">passed</span>，<span word="first">first</span>，<span word="throughan">throughan</span> <span word="enormous">enormous</span> <span word="thickness">thickness</span> <span word="of">of</span> <span word="the">the</span> <span word="higher">higher</span> <span word="strata">strata</span> <span word="of">of</span> <span word="the">the</span> <span word="air">air</span>，<span word="the">the</span> <span word="minute">minute</span> <span word="dust">dust</span> <span word="of">of</span> <span word="whichreflects">whichreflects</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="higher">higher</span> <span word="strata">strata</span> <span word="of">of</span> <span word="the">the</span> <span word="air">air</span>，<span word="the">the</span> <span word="minute">minute</span> <span word="dust">dust</span> <span word="of">of</span> <span word="which">which</span> <span word="reflectsmost">reflectsmost</span> <span word="of">of</span> <span word="the">the</span> <span word="blue">blue</span> <span word="rays">rays</span> <span word="away">away</span> <span word="from">from</span> <span word="us">us</span>，<span word="leaving">leaving</span> <span word="the">the</span> <span word="complementary">complementary</span> <span word="yellow">yellow</span> <span word="light">light</span> <span word="topass">topass</span> <span word="on">on</span>，<span word="Then">Then</span>，<span word="the">the</span> <span word="somewhat">somewhat</span> <span word="coarser">coarser</span> <span word="dust">dust</span> <span word="reflects">reflects</span> <span word="the">the</span> <span word="green">green</span> <span word="rays">rays</span>，<span word="leaving">leaving</span> <span word="a">a</span> <span word="moreorange">moreorange</span>-<span word="coloured">coloured</span> <span word="light">light</span> <span word="to">to</span> <span word="pass">pass</span> <span word="on">on</span>；<span word="and">and</span> <span word="finally">finally</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="yellow">yellow</span> <span word="isreflected">isreflected</span>，<span word="leaving">leaving</span> <span word="almost">almost</span> <span word="pure">pure</span> <span word="red">red</span>. <span word="But">But</span> <span word="owing">owing</span> <span word="to">to</span> <span word="the">the</span> <span word="constant">constant</span> <span word="presence">presence</span> <span word="of">of</span> <span word="aircurrents">aircurrents</span>，<span word="arranging">arranging</span> <span word="both">both</span> <span word="the">the</span> <span word="dust">dust</span> <span word="and">and</span> <span word="vapour">vapour</span> <span word="in">in</span> <span word="strata">strata</span> <span word="of">of</span> <span word="varying">varying</span> <span word="extent">extent</span> <span word="anddensity">anddensity</span>，<span word="and">and</span> <span word="of">of</span> <span word="high">high</span> <span word="or">or</span> <span word="low">low</span> <span word="clouds">clouds</span> <span word="which">which</span> <span word="both">both</span> <span word="absorb">absorb</span> <span word="and">and</span> <span word="reflect">reflect</span> <span word="the">the</span> <span word="light">light</span> <span word="invarying">invarying</span> <span word="degrees">degrees</span>，<span word="we">we</span> <span word="see">see</span> <span word="produced">produced</span> <span word="all">all</span> <span word="those">those</span> <span word="wondrous">wondrous</span> <span word="combinations">combinations</span> <span word="of">of</span> <span word="tints">tints</span> <span word="andthose">andthose</span> <span word="gorgeous">gorgeous</span> <span word="ever">ever</span>-<span word="changing">changing</span> <span word="colours">colours</span> <span word="which">which</span> <span word="are">are</span> <span word="a">a</span> <span word="constant">constant</span> <span word="source">source</span> <span word="of">of</span> <span word="admirationand">admirationand</span> <span word="delight">delight</span> <span word="to">to</span> <span word="all">all</span> <span word="who">who</span> <span word="have">have</span> <span word="the">the</span> <span word="advantage">advantage</span> <span word="of">of</span> <span word="an">an</span> <span word="uninterrupted">uninterrupted</span> <span word="view">view</span> <span word="to">to</span> <span word="the">the</span> <span word="westand">westand</span> <span word="who">who</span> <span word="are">are</span> <span word="accustomed">accustomed</span> <span word="to">to</span> <span word="watch">watch</span> <span word="for">for</span> <span word="those">those</span> <span word="not">not</span> <span word="infrequent">infrequent</span> <span word="exhibitions">exhibitions</span> <span word="of">of</span> <span word="nature">nature</span>&<span word="lsquo">lsquo</span>;<span word="skaleidoscopic">skaleidoscopic</span> <span word="colour">colour</span> <span word="painting">painting</span>. <span word="With">With</span> <span word="every">every</span> <span word="change">change</span> <span word="in">in</span> <span word="the">the</span> <span word="altitude">altitude</span> <span word="of">of</span> <span word="the">the</span> <span word="sun">sun</span> <span word="thedisplay">thedisplay</span> <span word="changes">changes</span> <span word="its">its</span> <span word="character">character</span>；<span word="and">and</span> <span word="most">most</span> <span word="of">of</span> <span word="all">all</span> <span word="when">when</span> <span word="it">it</span> <span word="has">has</span> <span word="sunk">sunk</span> <span word="below">below</span> <span word="thehorizon">thehorizon</span>，<span word="and">and</span> <span word="owing">owing</span> <span word="to">to</span> <span word="the">the</span> <span word="more">more</span> <span word="favourable">favourable</span> <span word="angles">angles</span> <span word="a">a</span> <span word="larger">larger</span> <span word="quantity">quantity</span> <span word="of">of</span> <span word="thecoloured">thecoloured</span> <span word="light">light</span> <span word="is">is</span> <span word="reflected">reflected</span> <span word="toward">toward</span> <span word="us">us</span>，<span word="Especially">Especially</span> <span word="when">when</span> <span word="there">there</span> <span word="is">is</span> <span word="a">a</span> <span word="certain">certain</span> <span word="amountof">amountof</span> <span word="cloud">cloud</span> <span word="is">is</span> <span word="this">this</span> <span word="the">the</span> <span word="case">case</span>. <span word="These">These</span>，<span word="so">so</span> <span word="long">long</span> <span word="as">as</span> <span word="the">the</span> <span word="sun">sun</span> <span word="was">was</span> <span word="above">above</span> <span word="thehorizon">thehorizon</span>，<span word="intercepted">intercepted</span> <span word="much">much</span> <span word="of">of</span> <span word="the">the</span> <span word="light">light</span> <span word="and">and</span> <span word="colour">colour</span>，<span word="but">but</span> <span word="when">when</span> <span word="the">the</span> <span word="great">great</span> <span word="luminary">luminary</span> <span word="haspassed">haspassed</span> <span word="away">away</span> <span word="from">from</span> <span word="our">our</span> <span word="direct">direct</span> <span word="vision">vision</span>，<span word="his">his</span> <span word="light">light</span> <span word="shines">shines</span> <span word="more">more</span> <span word="directly">directly</span> <span word="on">on</span> <span word="the">the</span> <span word="undersides">undersides</span> <span word="of">of</span> <span word="all">all</span> <span word="the">the</span> <span word="clouds">clouds</span> <span word="and">and</span> <span word="air">air</span> <span word="strata">strata</span> <span word="of">of</span> <span word="different">different</span> <span word="densities">densities</span>；<span word="a">a</span> <span word="new">new</span> <span word="and">and</span> <span word="morebrilliant">morebrilliant</span> <span word="light">light</span> <span word="flushes">flushes</span> <span word="the">the</span> <span word="western">western</span> <span word="sky">sky</span>，<span word="and">and</span> <span word="a">a</span> <span word="display">display</span> <span word="of">of</span> <span word="gorgeous">gorgeous</span> <span word="ever">ever</span>-<span word="changingtints">changingtints</span> <span word="occurs">occurs</span> <span word="which">which</span> <span word="are">are</span> <span word="at">at</span> <span word="once">once</span> <span word="the">the</span> <span word="delight">delight</span> <span word="of">of</span> <span word="the">the</span> <span word="beholder">beholder</span> <span word="and">and</span> <span word="the">the</span> <span word="despair">despair</span> <span word="ofthe">ofthe</span> <span word="artist">artist</span>. <span word="And">And</span> <span word="all">all</span> <span word="this">this</span> <span word="unsurpassable">unsurpassable</span> <span word="glory">glory</span> <span word="we">we</span> <span word="oweto">oweto</span>&<span word="mdash">mdash</span>;&<span word="mdash">mdash</span>;<span word="dust">dust</span>！</p>
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