370 E. A. BAUMGARTNER 



pieces and the stalks have lumens. In another specimen 19 

 cm. long, a spherical thyroid-like mass is present in the base 

 of the tongue above the hyoid bone. It is made up of follicles 

 which contain a colloid-like substance. No connection between 

 this mass and any duct system is apparent. 



Sections of a tongue of a 23.5 cm. fetus show twenty-six and 

 forty ducts respectively in connection with the first and third 

 papilla on the right side. The second papilla on the left side 

 is provided with forty-five ducts. One of the ducts in this 

 specimen has a greatly dilated end from which small ducts 

 radiate in all directions. This cystic enlargement, irregular in 

 shape, is lined by a layer of flattened epithelium and measures 

 0.6 by 0.4 by 0.15 mm. in its greatest diameters. 



The vallate papillae of a fetus 25 cm. in length, of a new 

 born, and of a nine months old child, all show the characteristic 

 short and long glands sending off many branches wdth terminal 

 arborization of alveolar-like glands with occasional anastomoses. 

 The longest ducts extend into the upper strata of the trans- 

 verse muscle, the gland masses being broken up by the vertical 

 and the longitudinal muscle fibers. A small group of glands 

 in the tongue of the nine months old child were modeled (fig. 8). 

 Some of the glands are irregular in shape, showing constrictions, 

 outpouchings and anastomoses. The method of formation ap- 

 parently is as pre\'iously described. The main ducts fre- 

 quently present many small, solid outpouchings, the anlagen of 

 other gland groups. Two such anlagen attached to the large 

 duct near the gland appear in the model (fig. 8). 



Two papillae in a newborn have associated with them thirty- 

 eight and forty-three ducts respectively. In another specimen 

 three papillae have thirty-two, thirty-three, and thirty-eight 

 ducts resj>ectively. One of the latter with its gland gi'oups, 

 from the caudal end of a papilla, was reconstructed. Twenty- 

 one groups of glands are attached to this main duct by means 

 of small lateral or terminal branches (fig. 1). The gland masses 

 extend beyond all sides of the papilla, spreading antero-poste- 

 riorly 2.2 mm., laterally 1.3 mm. and projecting into the tongue 

 tissue about 1.2 mm. Since the antero-posterior diameter of 



