concerning Animal Impregnation. 19 1 
means to seal up the communication between the cavity of 
the uterus and vagina. 
Ninthly. Nor does the care of nature for the preservation 
of the new animal terminate here ; for while she is by various 
means forming and perfecting her work, at least as far as 
comes within the province of the uterine system, she is at the 
same time making preparation for its nourishment after birth, 
by instituting the proper secretion of the breasts. 
When we take a reflected survey of these successive opera- 
tions, I think it must appear, on tracing nature's steps through 
the different stages of this work, that they are the product of 
that law in the constitution which is called sympathy, or consent 
of parts. 
That the semen first stimulates the vagina, os uteri, cavity 
of the uterus, or all of them. 
. By sympathy the ovarian vesicles enlarge, project, and burst. 
By sympathy the tubes incline to the ovaries, and having 
embraced them, convey the rudiments of the foetus into the 
uterus. 
By sympathy the uterus makes the necessary preparation for 
perfecting the formation and growth of the foetus. And, 
By sympathy the breasts furnish milk for its support after 
birth. 
Having now investigated this intricate question, I hope 
with some regularity ; the design of this essay next leads me 
to consider the state or form of that substance which passes 
from the ovaries in consequence of impregnation. 
