Earl T. Engle 
Problem of Fertility [PDF ebook] 

This collection of papers and discussions from the Conference on Fertility of the National Committee on Maternal Health, held in February 1946, presents the most recent advances in the field of fertility. The plan of the book covers the relation of fertility to the time of ovulation, the effect of the condition of the cervical mucus, and finally the motility, viability and fertilizing capacity of spermatozoa.
Originally published in 1946.
The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.