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HANDBOOK OF PHYSIOLOGY. 



but in part solidified after death (Fig. 40). A nucleus is always present 

 in some part or other of the cell-protoplasm, but in the ordinary condi- 

 tion of the cell it is not easily or always visible. 



FIG. 40. 



FIG. 41. 



Fia. 40. Ordinary fat cells of a fat tract in the omentum of a rat. (Klein.) 

 FIG. 41. Group of fat cells (FC) with capillary vessels (O- (Noble Smith.) 



This membrane and the nucleus can generally be brought into view 

 by staining the tissue; it can be still more satisfactorily demonstrated by 

 extracting the contents of the fat-cells with ether, when the shrunken, 



FIG. 42. 



FIG. 43. 



FIG. 42. Blood-vessels of adipose tissue. A. Minute flattened fat-lobule, in which the vessels 

 only are represented, a, the terminal artery; i>, the primitive vein; 6, the fat- vesicles of one border 

 of the lobule separately represented, x 100. B. Plan of the arrangement of the capillaries (c) on 

 the exterior of the vesicles; more highly magnified. (Todd and Bowman.) 



FIG. 43. A lobule of developing adipose tissue from an eight months 1 foetus, a. Spherical or, 

 from pressure, polyhedral cells with large central nucleus, surrounded by a finely reticulated sub- 

 stance staining uniformly with haematoxylin. 6. Similar cells with space from which the fat has 

 been removed by oil of cloves, c. Similar cells showing how the nucleus with inclosing protoplasm 

 is being pressed towards periphery, d. Nucleus of endothelium of investigating capillaries. (Mc- 

 Carthy.) Drawn by Treves. 



