DIFFERENTSYSTEMS. 105 



and it was of a dark colour ; the two ventricles 

 of the heart beat ; the body of the chick was co- 

 vered with fkin ; and the points of the feathers 

 began to appear. On the leventh day, the head 

 was very large; the brain was covered with its 

 membranes; the beak appeared between the two 

 eyes ; the wings, the thighs, and the legs, had 

 acquired their perfe(5l form ; the heart feemed 

 to be compofed of two ventricles, like two con- 

 tiguous globules, united at their fuperior part 

 with the auricles; and two fucceifive pulfes v/ere 

 remarked both in the ventricles and auricles, as 

 If there had been two feparate hearts. 



But I will follow Malpighius no farther. The 

 remainder of the detail regards the growth and 

 perfedion of the parts till the chick breaks the 

 ihell in which it is inclofed, and becomes an in- 

 habitant of a new world. The heart is the lafl 

 part that afTumes its proper figure, by the union 

 of its ventricles, which happens not till the e- 

 levenih day. 



We are now in a condition to form a diftind; 

 judgment concerning the value of Harvey's ex- 

 periments. It is probable that this celebrated 

 anatomill did not make ufe of the microfcope, 

 (whicli was, indeed, very imperfe^l^lly known in 

 his days), otherwife he never would have affirm- 

 ed, that there was no diflerencc between the 

 cicatrice of impregnated and unimpregnatcd 

 eggs; he never would have faid, that the fem.cn 

 of the male produced no change upon the egg, 



and 



