LECTURE XVI. 
ADIPOSE TISSUE, 
Next in our order of arrangement, among the true 
cellular tissues, is Adipose tissue , which consists of cells 
having walls composed of structureless membrane, 
containing within them the substance known as fat . 
This exists, in ordinary animals, in three states, either as 
oil, lard, or tallow; but in one species of Whale , the 
Physeter macro cephalus, it is in the form of spermaceti. 
The three first being distinguished by their relative firm- 
ness at ordinary temperatures, while the last differs in toto 
in its chemical properties. In the majority of works on 
anatomy, and in common parlance, the term fat is given 
to masses of these cells, but in modern science adipose 
tissue is the name applied to the mass of cells, and fat 
to their contents. The cells of adipose tissue, when 
occurring singly are globular, but when subjected to 
