128 



t?rc?e. The other viscera appear sncoessiveiyj HUG 

 ' rar.ge themselves after eacli other, round the living* 



speck. We cannot as yet discover. "any ^eutnii folding ;, 



alils tnu:s*<aunt ov 3iu*Jy so; and we aiilv perceive by. 



little and lit tie those teguments vv-hich are appointed to, 



ccver all the parts. 



In its first beginnings the, ai^ma! is almost entirely-,-- 



fluid. It assumes by degrees the- consistence of a je41y,-. 



-Ail the parts have at that time situations, forms, and 



proper* ions, that ilifter gi\vitly from those, they will at-. 



terwards .. axqui;.e. Their minuteness/ softness, and 



Iraii.spsn-iK'y, Mive to strengthen the illusion. We per-. 



suade ohisil\es that a bowel is naked, Inrcaiise the- 



transparercy of its coverings prevents our seeing them. 

 "Would you have a. short and easy demonstration of 



this? When the lungs of the chick are first pereeivable, 

 their size is but the thousandth part of an inch. It 

 \vouh have been visible at the fourth part of these di- 

 mensions, were it not endued with the most perfect 

 transparency. The liver is much greater at its first ap- 

 pearance ; iv transparency alone- renders it invisible. It 

 is the same with respect to the kklme; whilst they do 

 not even appear to exist, they separate the. urine. The 

 heart .-forces the blood into the arteries sooner than we 

 could imagine, and it can only be perceived by the 

 growth of the embryo, which is. never more accelerated 

 than at the very beginning. 



Many other facts concur with these to establish the- 

 pre-existence of organical wholes. We are- now sensi- 

 ble thai many insects" multiply, like plants, by slips. We 

 cut. them into pieces, and eaeh piece regenerates, .and be- 

 comes a perfect animal. Earth worms ara ranked ia 

 the number of those insects that are reproduced from 

 their disjoined parts ; and being very large, the pheno- 

 mena of their regeneration is very perceptible. The 

 piece thai is cut off never acquires any growth; it al- 

 ways remains as the section left it; only it mils away in , 

 a- greater or lesser degree. But after some time there 

 appears. a. very sroall whitish pimple at its extremity, 

 wlircii increases by degrees ia bulk and length^ There:, 



