Brown Adipose Tissue in the Rat 



185 



the cell which might accompany lipid release. Ar- 

 guing thus, and making these assumptions, it would 

 be expected that if the cytoplasm is less "compressed" 

 in the brown fat cell of starvation, then the popula- 

 tion density of mitochondria would decline, in fact 

 there are many more mitochondria per unit area 

 than in the normal controls and from what has been 

 said it is reasonable to postulate an actual increased 

 production of these bodies during starvation and 

 following adrenalectomy. 



1 am indebted to Professor .1. D. Boyd for his interest 

 and criticism and to Dr. V. E. Cosslett for electron 

 microscope facilities at the Cavendish Laboratory, Cam- 

 bridge. 



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I I 

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