SECT. XXXIX. 4. GENERATION, 561 



leaves or roots ; but for the purpoie of feminal or 

 amatorial reproduction, where fenfution is required, 

 a ,more flimulating food becomes neceflary for the 

 anther, and fligma ; and this food is honey ; as ex- 

 plained in Sect. XIII. on Vegetable Animation. 



The gnat and the tadpole referable each other in 

 .their change from natant animals with gills into 

 -aerial animals with lungs ; and in their change of 

 the element in which they live; and probably of the 

 food, with which they are fupported; and laftly, 

 with their acquiring in their new Mate the difference 

 of fex, and the organs of feminal or amatorial re- 

 production. While the polypus, who is their com- 

 panion in their former itate of life* not being al- 

 lowed to change bis form and element, can only 

 propagate like vegetable buds by the fame kind of 

 irritative motions, which produces the growth of 

 Jiis own body, without the feminal or amatorial 

 propagation, which requires fenfation, and which 

 in gnats and tadpoles feemsto require a change both 

 of food and of refpiratiou. 



From hence I conclude, that with the aequifitiGa 

 of new pans, new fenfations., and .new detires, as 

 well as new powers, are produced; and this by ac^ 

 cretion to xhe old orues, and not by diitention of 

 them. And finally, that the rnoft effential parts of 

 the fyftem, as the brain for the purpofe of diitri- 

 buting the power of life, and the placenta for the 

 purpofe of oxygenating the blood, and the additi- 

 onal abforbent veffels for the purpofe of acquiring 

 aliment, are firft formed by the irritations above 

 mentioned, and by the pleafurable fenfations attend- 

 ing thoie irritations, and by the exertions in confe- 

 quence of painful fenfations, fimilar to thofe of 

 hunger and fufFocation. After thefe an apparatus of 

 limbs for future ufes, or for the purpofe of moving 

 .the body in its prefent natant itate, and of lungs for 

 future refpiration, and of teltes for future repro- 



duclion, 



