Dr. Raymond Pearl, Professor of Biology, School of Hygiene and Public Health, Johns Hopkins University, delivered the Patten Foundation Lectures at Indiana University in October, 1938. It was his intention to expand these five lectures before final publication. Other duties interfered and the work was left incomplete at the time of his death, November 17, 1940. Mrs. Pearl, with the help of some of Dr. Pearl's friends, reedited the manuscript and gave it to the University in its present form. In presenting the manuscript, Mrs. Pearl recognized its incompleteness and even its imperfections, for no one could do the task as Dr. Pearl, himself, would have done it.
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