318 



C. M. JACKSON 



whole follicle is but slightly below the normal size, it follows that 

 the cells are more reduced in height than in width. In some 

 glands, the follicular epithelium is very strikingly flattened 

 throughout the entire gland, in no place exceeding 4 or 5 micra 

 in height. Such a condition is never found in the normal gland. 







r-^^^ 



'^^ 







- - ^ ^>>, 





Fig. 9 A portion of the same thyroid ghmd shown in figureG (rat No. 11.64, 

 maintenance from 21 to 73 days of age), magnified to show details of histological 

 structure. This area represents advanced stages of follicular degeneration. 

 Cells in various stages of degeneration and disintegration. Tendency to des- 

 quamation with destruction of colloid and obliteration of follicular cavity. Some 

 nuclei appear karyolytic, although karyojjycnosis pred(miinates, and karyor- 

 rhexis frequently appears. (X 750.) 



