Page:Popular Science Monthly Volume 67.djvu/108

102 Harvey, was brought into general use through his works. It is not to be taken in its full modern significance. With Harvey it meant simply that the embryos of all animals, the viviparous as well as the oviparous, originate in eggs, and it was directed against certain contrary medical theories of the time.

The first edition of his 'Generatione Animalium' London, 1651, is provided with an allegorical title-page embodying this idea. As

shown in Fig. 2, it represents Jove on a pedestal, uncovering a round box—or ovum—bearing the inscription ex ovo omnia and from the box issue all forms of living creatures including also man.

Malpighi.—The observer in embryology who looms into prominence between Harvey and Wolff, is Malpighi. He supplied what was greatly needed at the time—an illustrated account of the actual stages in development of the chick from the end of the first day to hatching, shorn of verbose references and speculations.

His observations on development are in two separate memoirs, both