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106. The converse observation, of the absence of grazers in areas of high phytoPlanktonconcentration, led Hardy to propose his principle of animal exclusion , which hypothesized that phytoplankton produced a repellent that excluded grazers from regions of high phytoplankton concentration. 107. Although these molecules allow radiation at visible at wave lengths, where most of the energy of sunlight is concentrated, to pass through, they absorb some of the longer-wavelength, infrared emission radiated from the Earths surface, radiation that would otherwise be transmitted back into space. 108. In addition, the style of some Black novels, like Jean Toomers Cane, verges on expressionism or surrealism, does this technique provide a counter point to the prevalent theme that portrays the fate against which Black heroes are pitted, a theme usually conveyed by more naturalistic modes of expression? 109. Roseenblatts thematic analysis permits considerable objectivity; he even explicitly states that it is not his intention to judge the merit of the various worksyet his reluctance seems misplaced, especially since an attempt to appraise might have led to interesting results. 110. Thus, for instance, it may come as a shock to mathematicians to learn that the Schrodinger equation for the hydrogen atom is not a literally correct description of this atom, but only an approximation to a somewhat more correct equation taking account of spin, magnetic dipole , and relatiristic effects, and that this corrected equation is itself only an imperfect approximation to an infinite set of quantum field theoretical equations. | 
