COMPOSITION OF ANIMALS AND OF FEEDING STUFFS 59 



FIG. 6 



The increase of adipose tissue, according to Waters and Bell, 1 takes 

 place in two ways : first by the formation of new cells and second by 

 an increase in the size of existing cells as the storage of fat proceeds. 

 They observed fat cells 

 ranging from 20 //, in di- 

 ameter in an emaciated 

 animal to about 60 p in an 

 animal in ordinary thrifty 

 condition and to as much 

 as 200 /w. in a very fat 

 animal. The corresponding 

 relative volumes, therefore, 

 are 1:27: 1000. 



There are two regions in 

 particular in which fat tends 

 to accumulate, viz., in the 

 subcutaneous connective 

 tissue and in the connective 

 tissue surrounding the in- 

 ternal organs, especially that 

 of the mesentery and omen- 

 turn, although all the looser 

 forms of connective tissue, 

 including, as already noted, 

 the connective tissue lying 

 between and within the 

 muscles, may serve for the 

 storage of fat. 



95. Composition of 

 adipose tissue. What is 

 here called adipose tissue 

 is commonly spoken of as 

 fat, but it is evident that 

 only a portion of it is fat 

 in the strict sense, the re- 

 mainder consisting of con- 

 nective tissue, made up of 

 albuminoids, or collagens, 

 together with their ac- 



T . 



companymg water. It is 



FIG. 



FIGS. 6-8. Successive stages in the forma- 



tion of adipose tissue (Hough and Se dgwick, 



this nitrogenous material The Human Mechanism.) 



1 Proceedings, Soc. Prom. Agri. Science, 1909, pp. 20-24. 



