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The botanist , who joined the Yale faculty in 1955 and retired from teaching in 1990 , is the author of several hooks , including " Principles of Plant Physiology , " which was a standard textbook for a generation , and " Life Processes in Plants , " which was published this year as part of the Scientific American Library series . Since forests are safest , most IDPs hide there , but " life in the jungle is harsh , and becomes even harsher the longer people stay " . Success in nature , and in life , with their changes - - as man knows ' nature ' and ' life ' - - arise from the interstarry , mechanical modifications , and the incidents ( and , the apparent interference and intertangle ) through the restless movement of the planets . This is what the New Testament means by " life after the Spirit " or " life in faith " . But postmodernists in the humanities are not likely to defend something as banal and deconstructible as the intrinsic worth of humanity , and will tend rather to celebrate this " subversion " or overturning of categories like " natural " and " artificial " and " life .