PLATE 3 



EXPLANATION OF FIGURES 



7 Lateral view of a reconstruction of some short glands from a 19 cm. fetus. 

 X 135. 



8 Reconstruction of a small group of glands connected by a terminal duct 

 to a larger collecting duct from a nine months old child. X 135. 



9 Reconstruction of a small group of glands, a larger collecting duct and a 

 small simple outgrowth anastomosing with the glands of the group, from an 

 adult specimen of twenty-two years. X 166. 



10 Reconstruction of another group of glands showing alveolar-like end- 

 pieces from a specimen twenty-two years of age. X 166. a, alveolar end-pieces 

 opening through an alveolus into the terminal duct; D, main duct; d, terminal 

 duct to gland group; ^, early gland anlagen from main duct. 



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