276 HISTOLOGY OF THE MORBID PROCESSES. 



The glycogen occurs either in granules or in small, irregular 

 masses within the cytoplasm (Fig. 249). It is soluble in water, and 

 its detection is a matter of difficulty unless special methods of prep- 



FIG. 249. 



9 



'^fi-A, *vvs!r* 



a, 



Glycogenic infiltration of the cells in an endothelioma. (Driessen.) a, cell crowded with 

 granular masses of glycogen ; 6, fibrous tissue forming the stroma of the tumor ; c, space 

 within the growth containing blood. Section from an endothelioma of bone, stained 

 with a solution of iodine and gum-arabic in water. Iodine stains glycogen brown. The 

 nuclei and cytoplasm of the cells are not represented. A section from the same tumor 

 after the extraction of the glycogen and staining with nuclear dyes is shown in Fig. 222. 



aration are employed to retain it in situ and so facilitate its recog- 

 nition. When it is dissolved from the cytoplasm it leaves small, 

 clear, empty spaces behind. 



Glycogenic infiltration is a normal condition in the cells of the 

 liver and in muscular fibres. In the latter situation it serves as a 

 store of rapidly available energy, which can be drawn upon during 

 the functional activity of the cells. In the liver it serves a similar 

 purpose for the whole body. 



5. Serous Infiltration. In oedematous conditions of the tissues 

 their cells sometimes imbibe fluid from their surroundings, which 

 appears as clear drops or vacuoles within the cytoplasm (Fig. 250). 

 The condition may subsequently subside, or it may lead to a disin- 

 tegration of the cytoplasm and nucleus. The cell then undergoes 

 a form of destruction very closely resembling that in albuminoid 



