Chap. IV. 
MANNER OF DEVELOPMENT. 
123 
tlie higher apes and man. The rodents exhibit a per- 
tect series of gradations between these two extreme 
states. In all mammals the uterus is developed from 
two simple primitive tubes, the inferior portions of 
which form the cornua; and it is in the words of 
Dr. Farre “ by the coalescence of the two cornua at 
“ their lower extremities that the body of the uterus is 
“formed in man ; while in those animals in which no 
“ middle portion or body exists, the cornua remain un- 
“ united. As the development of the uterus proceeds, 
“ the two cornua become gradually shorter, until at 
“length they are lost, or, as it were, absorbed into the 
“body of tlie uterus.” The angles of the uterus are 
still produced into cornua, even so high in the scale as 
in the lower apes, and their allies the lemurs. 
Now in women anomalous cases are not very infre- 
quent, in which the mature uterus is furnished with 
cornua, or is partially divided into two organs; and 
such cases, according to Owen, repeat “ the grade of con- 
“ centrative development,” attained by certain rodents. 
Here perhaps we have an instance of a simple arrest ol 
embryonic development, with subsequent growth and 
perfect functional development, for either side of the 
partially double uterus is capable of performing the 
proper office of gestation. In other and rarer cases, 
two distinct uterine cavities are formed, each having 
its proper orifice and passage . 36 No such stage is passed 
through during the ordinary development of the embryo, 
m ul it is difficult to believe, though perhaps not im- 
possible, that the two simple, minute, primitive tubes 
®°nld know how (if such an expression may be used) to 
3i See Dr. A. Farre’s well-known article in the 1 Cyclop, of Anat. 
fyd Pliys.’ vol. v. 1859, p. 642. Owen ‘ Anatomy of Vertebrates,’ vol. 
fit 1868, p. 687. Prof. Turner in ‘ Edinburgh Medical Journal,’ Feb. 
1865. 
