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Pesticides 农药 Smoking them out 把它们熏死 Tobacco extracts protect plants from pests andpathogens 烟草提取物可用于植物病虫害 THERE are, as Paracelsus put it, no poisonsonlypoisonous doses. 巴拉赛尔士曾说：世上其实没有毒药，所谓的毒性只是剂量变化引起的而已。 That is certainly true of nicotine. 对于尼古丁，这当然是确切无疑的。 The amount in a puff from a cigarette acts as a pleasant stimulus. 吸一口烟你可能会觉得神清气爽， The amount in a packet of 20, injected in one go, would kill you. 但是如果一次性注射一包20支烟的尼古丁剂量，可是会要了你的命的。 The Victorians understood this and regularly used nicotine as a lethal poisonnot forpeople except in the minds of a few crime novelists but for insects. 维多利亚时代的人明白这一点，并且已经把尼古丁作为一种常见的致命毒药来使用不是用来杀人除了在一些犯罪小说家的构思中，而是用来杀虫。 The invention of modern, synthetic insecticides has more or less killed that practice off. | 
