472 David M. Davis. 
tively. Circulatory conditions, as yet not clearly understood, 
almost immediately force upon these minute capillaries a speedy 
and tremendous enlargement, so that they quickly constitute 
the vena cava inferior in this region. 
My thanks are due Professor Mall, for the suggestion of this 
research as well as for his generous supervision. I also wish to 
express my appreciation of the constant interest and invalu- 
able suggestions and criticisms of Dr. Evans. 
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