SHCT. XVI. 3. OF INSTINCT. 149 



great quantity foon after their birth ; (Gipfon, 

 Med. Mays, Edinb. V. i. 13. Halleri Phyfiolog. 

 T. 3. p. 318. and T. 8). In the ftomach of a calf 

 the quantity of this liquid amounted to about 

 three pints, and the hairs amongft it were of the 

 fame colour with thofe on its ikin, (Blafii Anat. 

 Animal, p. m. 122). Thefe facls are attefted by 

 many other writers of credit, befides thofe above 

 mentioned. 



111. It has been deemed a furprifing inftance of 

 inftincl:, that calves and chickens fhould be able 

 to walk by a few efforts almoft immediately after 

 their nativity : whilft the human infant in thofe 

 countries where he is not incumbered with clothes, 

 as in India, is five or fix months, and in our cli- 

 mate almoft a twelvemonth, before he can fafely 

 Hand upon his feet. 



The ftruggles of all animals in the womb muft 

 refemble their mode of fwimming, as by this kind 

 of motion they can beft change their attitude in 

 water. But the fwimming of the calf and chicken 

 refembles their manner of walking, which they 

 have thus in part acquired before their nativity, 

 and hence accompliih it afterwards with very few 

 efforts, whilft the fwimming of the human crea- 

 ture refembles that of the frog, and totally differs 

 from his mode of walking. 



There is another circumftance to be attended to 

 in this affair, that not only the growth of thofe 

 peculiar parts of animals, which are firft wanted 

 to fecure their fubfiftence, are in general furtheft 

 advanced before their nativity : but fome animals 

 come into the world more completely formed 

 throughout their whole fyftem than others : and 

 are thence much forwarder in all their habits of 



motion* 



