of the Mammary Organs of the Kangaroo. 65 



to the other, producing a perfect teat in miniature, in the exact 

 situation at which it is found in the adult impregnated animal 

 {tah.S.f. 1. a.). 



I do not mean to infer from this, that pressure upon this part 

 constitutes the means employed by nature for the development 

 of the teat ; but I mention this experiment to prove the possi- 

 bility of eversion without necessary laceration of the part. The 

 natural process by which this change is effected I have had no 

 opportunity of ascertaining; yet in the absence of positive 

 proof, the collateral evidence that such a change must take 

 place seems to me too strong to admit of doubt. The com- 

 plete absence of the third and fourth teats in the young female, 

 and the exact correspondence between the situation of the open- 

 ings of these canals, and the spot to which these supernumerary 

 teats are always found attached, together with the exact minia- 

 ture resemblance to those structures, which an artificial develop- 

 ment produces ; and, above all, the total want of any other 

 structures connected with these parts, by which the production 

 of the other teats can be in any way accounted for, — these com- 

 bined circumstances afford evidence which, even unsupported 

 by any other facts, must, I think, be allowed as confirming the 

 correctness of my views upon this subject. 



I have lately examined a young Kangaroo, preserved in the 

 Museum of the Royal College of Surgeons, and which had but 

 a few days only been received into the pouch (tab. 3. f. 2.). 

 On comparing the extremely minute orifice which forms the 

 mouth of the animal at this early period, with the teats of adult 

 females during the time of suckling (tab. 3. /. 3.), it seems im- 

 possible, from the great size of these parts, that their com- 

 paratively enormous extremities should be received within so 

 small an aperture as that afforded by the minute opening 

 between the lips of the young at this early state of its exist- 

 , VOL. XVI. K ence ; 



