MOHIMIOGENESIS OF THE FOLLICLES 



425 



Fig. 3 Small portion of a cross section of the thyroid gland in a human 

 fetus 30 mm. long (No. 30), magnified to show the cell structure. The location 

 of the section is indicated (a-b) in figure 14. Note the appearance of lumina 

 (L.) in buds {B.) from the surface of the plate as well as in swellings along its 

 course (L'). In the upper left hand corner a section through one of the hollow 

 epithelial prisms is seen (Ep.P.). Mes., mesenchyme. X 400. 



Fig. 4 Drawing of a section through follicle 'd' in figure 16. Note the irreg- 

 ular form of the follicle, both the lumen (L.) and the wall. Mes., mesenchyme; 

 S.B., solid bud. X 400. 



Fig. 5 Drawing of a section through an epithelial plate taken at the level 

 marked a-b in figure 7. Mes., mesenchyme; L., lumen; Cap., capillary; Ep.T., 

 epithelial tag. X 400. 



THE AMERICAX JOURNAL OF ANATOMY, VOL. 20, NO. 3 



