“I shall begin at the beginning,” said the D.H.C. and the more zealous students recorded his intention in their notebooks: Begin at the beginning. “These,” he waved his hand, “are the incubators.” And opening an insulated door he showed them racks upon racks of numbered test-tubes. “The week’s supply of ova. Kept,” he explained, “at blood heat; whereas the male gametes,” and here he opened another door, “they have to be kept at thirty- five instead of thirty-seven. Full blood heat sterilizes.” Rams wrapped in theremogene beget no lambs. Still leaning against the incubators he gave them, while the pencils scurried illegibly across the pages, a brief description of the modern fertilizing process; spoke first, of course, of its surgical introduction- “the operation undergone voluntarily for the good of Society, not to mention the fact that it carries a bonus amounting to six months’ salary” ; continued with some account of the technique for preserving the excised ovary alive and acti