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EMBRYOLOGY. 



duct immediately behind the pronephric tubules. The duct con- 

 sequently serves from this time forward as an outlet for the newly 

 formed glandular organ also, and can therefore be designated as 

 mesonephric or Wolffian duct. 



When it is stated that a gland is developed on the mesonephrio 



duct, one at first thinks that lateral buds grow out from its wall and 

 give forth branches, as occurs in the fundaments of g'ands formed 

 from the outer or the inner germ-layers. Nothing of the kind takes 

 place here. All observers — with the exception of a few earlier 

 investigators — agree rather that the glandular tubules of the meso- 

 nephros arise independently of the mesonephric duct. The source 



