The nature and localization of the brown adipose in young calves, lambs, and in practically full-term foetuses of cows and sheep has been examined. It was found that brown adipose tissue could be composed of types of fat cells greatly differing mutually and that, in lambs, a greater variety of cell-types is to be found than in calves. These types of fat cells, or the types of adipose tissue consisting of them, may transmute into one another. As a rule, these transformations begin to take place in the adipose tissue of the thorax, the more peripheral adipose tissue gradually being involved.
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