EXPLANATION OF THE PLATES. 



The figures contained in this and the following plate are magnified 

 130 diameters. 



PLATE XVIII. 



FAT. 



Fig. 1. A portion of the great omentum of a child aged 

 seven years. The fat cells are seen to be small, 

 perfectly globular, and aggregated into clusters, 

 which lie near to and in the course of the blood- 

 vessels. 



Fig. 2. A portion of the fat of an adult taken from over the 

 gluteus muscle. The fat cells in it are observed 

 to be of larger size, and many of them are poly- 

 hedral ; these cells are also seen to be held in union 

 by an enclosing membrane of cellular tissue. 



