S CT . XXXIX. 7. GENERATION. 595 



filament ; in the fame manner as common nutrition 

 is performed in the adult animal. 



3. Then this new organization, or additional part, 

 becomes ftimulated by the nutritive particles in its 

 vicinity, and fenfation is now fuperadded to irritati- 

 on; and other particles are in confequence embra- 

 ced, and added to the living filament ; as is fcen in 

 the new granulations of fiefh in ulcers. 



By the power of affociation, or by irritation, the 

 parts already produced continue their motions, and 

 new ones are added by fenfation, as above mention- 

 ed ; and laftly by volition, which laft fenforial power 

 is proved to exift in the fetus in its maturer age, 

 becaufe it has evidently periods of activity and of 

 fleeping ; which laft is another word for a tempora- 

 ry iufpenfion of volition. 



The original living filament may be conceived to 

 poflefs a power of repulfing the particles applied to 

 certain parts of it, as well as of embracing others, 

 which flirnulate other parts of it ; as thefe powers 

 exifl in different parts of the mature animal ; thus 

 the mouth of every gland embraces the particles or 

 fluid, which fuits its appetency ; and its excretory 

 duel: repulfes thofe particles, which are difagrecable 

 to it. 



4. Thus the outline or miniature of the new ani- 

 mal is produced gradually, but in no great length of 

 time ; becaufe the original nutritive particles require 

 no previous preparation by digeftion, fecretion, and 

 oxygenation : but require fimply the feieclion and 

 appofition, which is performed by the lining filament. 

 Mr. Blumenbach fays, that he poflefles a human 

 fetus of only five weeks old, which is the fize of a 

 common bee, and has all the features of the face, 

 every finger, and every toe, complete ; and in which 

 the organs of generation are diftindily feen. P. 76. 

 In another fetus, whofe head was not larger than a 

 pea, the whole of the bafis of the fkull with all its 



depreilions, 



