129 



" The Srd female had a mammary fcetus, about 4 incbes long from 

 the nose to the vent, adhering to the left lower nipple, covered likę 

 the preceding with a naked vascular integument, which probably 

 assists in oxygenating the blood. The eyes in this, as well as in 

 the preceding, were closed. The other nipples were everted, but 

 were not all of the šame length, the right lower nipple being shorter 

 than the right upper one. I could not ascertain when this female 

 had been injpregnated. 



" The ^th and 5th females had no young in the pouch ; all the 

 nipples were everted. 



" From this examination two facts were ascertained ; Ist, that the 

 Kangaroo, at least in a statė of captivity, has no particular period 

 or season for breeding ; and 2nd, that the upper as well as the lower 

 nipples are used both during the period of mammary gestation and 

 for the young animal's subseguent supplies of nourishment. 



" With respect to the female No. 2., the following facts relative 

 to her gestation were obtained from Joseph FuUer, Head Keeper at 

 the Farm. She received the malė on the 14th of Sfeptember 1832; 

 but copulation might also have occurred previously. On the lith 

 of October of the šame year FuUer observed her looking sickly, and 

 when the malė approached her she scratched and repulsed him. 

 He perceived rouch slime, likę white of egg, passing from the va- 

 gina. This was about 3 p.m., when he was unfortunately called 

 away on some business. In the evening, at 8 o'clock, suspecting 

 that parturition had taken place^ he examined her pouch, and found 

 a young one attached to a teat : on being touched the young one 

 dropped oflF to the bottom of the pouch. Next day he again examined 

 her, and found the young one adhering to the nipple. It fell oflF a se- 

 cond time on being handled, and both Joseph and Devereux Fuller 

 had the little one in their hands out of the pouch, and both assert 

 that it was not more than 1 inch in length. lt was again put into the 

 pouch, and the mother was meddled with no more till the Srd of 

 November following. On that day Mr. Yarrell and myself visited 

 the Farm, and on hearing this account we examined the female, 

 and found the young one, now 3 inches long, adhering strongly to 

 the nipple. On further questioning Fuller on the subject, he said, 

 that when first he saw the young one it was covered with blood-clot 

 or coagulum ; but on the following day it was quite clean and dry, 

 and moved its body vigorously. The mother still suckies one of the 

 previous year. 



" From Mr. Morgan's experiments it would appear that when the 

 mammary fcetus has arrived at nearly the size of a fully grovvn Nor- 

 ivay Rat, it vvill bear a separation from the nipple for two hours^ 

 and regain its hold. According to Fuller's statement it vvill bear a 

 separation from the nipple, and again become joined to it, at vvhat is 

 now proved to have been a very short period after uterine gestation ; 

 and Mr, CoUie's observations, in the 18th Number of the ' Zoological 

 Journal', are in confirmation of the šame opinion. It is still uncer- 

 tain in what manner it regained the nipple, although in a subsequent 

 experiment, where a similar fcetus was detached, the mother made 

 many, but, as it appeared, unsuccessful, attempts to replace it. 



"In order to ascertain precisely the period of gestation, as an es- 



