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RHODA ERDMANN 



the most striking phases of the activation of a fat cell. The 

 original fat cell, the fat cell which has extended fine pointed 

 processes, and the final stage that comprehends cells containing 

 vacuoles which may still have traces of fat in them. (Compare 

 cells on figure 2; figure 7, cell right side, above; and figures 45 

 and 46.) 



Text fig. A. Fat cells after 6 and 12 hours incubation. 



It must be kept in mind that these changes occur during the 

 first 24 hours or 48 hours of incubation. Figures 45 and 46 show 

 that in a 30 hours culture the dissolving of the big fat globules 

 and the dividing up of the fat cells has been in progress. The 

 cells form chains, typical for the stage of the culture of 24 to 48 

 hours of fat containing bone marrow. These cell chains flatten 

 out, fine processes are extruded which cover great areas and 

 may fuse with other cells in web-like masses. Figures 45 and 

 46 give a good surview of this process and such a cell is also 

 represented in figure 33. We note its enormous size, its big 

 vacuoles, its slender processes, its phagocytic capacity and its 

 small nucleus. In short, we see a so-called 'Riesenzelle' of Foot 



