411 



E. T. Bell. 



Text Fig. 3 represents a section vertical to the surface of the 

 kidney of a 25 cm. foetus. The section does not extend entirely to 

 the peritoneum. The preadipose tissue has branched out and become 

 subdivided into lobules (L). Numerous small blood vessels are to 

 be seen. 



Text Fig. 4, from a 40 cm. fcetus, shows a later stage than the 

 preceding. Groups of rounded fat cells have begun to appear around 

 the blood vessels. These small adipose lobules (a Z) increase in size 



"^^ ,^^''r •'^^^''. \C, ' V^^'C' i_'' c "^^v 



Text Figure 2. Transverse section tiirougli the renal preadipose tissue 

 of a 10 cm. foetns. 7)r, small blood vessel: fc, fibrillar connective tissue; /.•. 

 kidney ; /), peritoneum ; RP, renal preadipose tissue ; v, vein. Fixation, 

 Zenker's fluid. Iron-biem. stain, x 50. 



at the expense of the preadipose tissue around them, becoming closely 

 crowded, and finally forming a solid mass of young adipose tissue. 

 In foetuses over 40 cm. long the renal adipose tissue is usually a 

 solid mass as just described. One preadipose lobule forms a number 

 of adipose lobules. 



Structure of preadipose tissue. 

 Before describing the preadipose tissue of other regions, I shall 

 explain its structure here. Under moderate magnification the tissue 



