Note 7 — PROLEGOMENA.

Dr. Pockels calls this the Decidua—but in good truth it is the Cortex Ovi—for this good reason, that at so early a period, and even as late as the end of the first six weeks, the Decidua is many times larger in capacity than the ovulum, and is never globular like the latter. Besides, when Ovula of such early periods are thrown out, the decidua remains behind, and is ejected in its triangular shape, a little while, and sometimes even a day, after. In other respects, Dr. Pockels confirms Boer’s more precise description of the “Structure of the Ovum.”