262 Anatomy and Physiology of the 



by the pushing forwards of the liquor amnii. This fluid, con- 

 tained within its proper membrane, first appears at the " shape;" 

 and is commonly designated "the water bladder:" as soon as 

 it bursts, the propulsive action of the uterus is brought to bear 

 immediately on the body of the foetus, by which it is ultimately 

 expelled. In fig. 3 we have a view of the calf placed in the 



natural position and covered by the amnion, which, with its con- 

 tained fluid, is protruding from the shape : the sketch will ma- 

 terially assist the description I have given. 



