204 



BIOLOGY AND ITS MAKERS 



vesicles and eye-pockets. His delineation of heart, brain, 

 and eye-vesicles are far ahead of those illustrating Wolff's 

 Theoria Generationis, made nearly a hundred years later. 



Fig. 61 shows a few selected sketches from the various 

 plates of his embryological treatises, to compare with those of 

 Wolff. (See Fig. 63.) 



The original drawings for De Ovo Incubato, still in pos- 

 session of the Royal Society, are made in pencil and red chalk, 



Fig. 62. — Marcello Malpighi, 1628-1694. 



and an examination of them shows that they far surpass the 

 reproductions in finish and accuracy. 



While Harvey taught the gradual formation of parts, 

 Malpighi, from his own observations, supposed the rudiments 



