438 RETROGRESSIVE CHANGES 



is well preserved although it, too, may contain large masses of glycogen, 

 in which case there is no glycogen in the cytoplasm.'' Gl3'cogen is 

 found particularly in the epithelium of Henle's tubules," in heart 

 muscle, and in the leucocytes. Fiitterer describes masses of glj'cogen 

 in the cerebral capillaries, resembling an embolic process; it is also 

 present in the tissues of the eye.^ Experimental diabetes (pancreas 

 extirpation, piqure) produces a marked glycogenic infiltration.^ We 

 cannot yet change van Noorden's statement: "We lack the biological 

 explanation as to why certain cells retain the capacity to store glj'co- 

 gen and even exert it more actively than before, whilst the proper 

 organs for the storage of glycogen have lost it." 



* Askanazy and Hubschmann, Cent. f. Path., 1907 (18), 041. 

 ' See Fahr, Cent. f. Path., 1911 (22), 945. 



* Shimagawora, Klin. Monatsbl. Augenheilk., 1911 (12), G82. 

 9 Huber and MacLeod, Amer. Jour. Physioh, 1917 (42), 019. 



