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OSWALD S. LOWSLEY 



groups of tubules and not the individual branches, and the group- 

 ing of the duct openings of these tubules on the floor of the urethra 

 as they communicate with it, demonstrate clearly that this struc- 

 ture is an independent part of the prostate gland. 



Fig. 3 Composite drawing showing course of tubules of the middle lobe of pros- 

 tate; 12.5 cm. human fetus. Four months. X 30. 



The two lateral lobes are composed of tubules which are larger 

 in size and branch more extensively than those of the middle 

 lobe. The units composing these lobes grow posteriorly as well as 

 laterally and occupy a region to the outside of the middle lobe and 

 the ejaculatory ducts. In this specimen there are forty-six 

 tubules composing the lateral lobes, the ducts of which communi- 



