128 Origin and Destiny of Cholesterol in the Animal Organism. 



Little value can be given to the high figure obtained in Experiment XVII, 

 as the animal was ill at the time its blood was taken. 



It seems to us very doubtful whether the chemical methods of estimating 

 cholesterol, which we have endeavoured to make as perfect as possible, are 

 sufficiently accurate to enable us to draw definite conclusions without making 

 an enormous number of experiments of this type. We have, however, 

 recently found a material suitable for the food of cats, which can be rendered 

 cholesterol-free, and a series of experiments are in progress to compare the 

 effect on the blood of the addition of cholesterol to such a diet both by 

 chemical analysis and by comparisons of the anti-hsemolytic effect of the 

 sera. The results of these experiments, which we expect to give more 

 definite information on this subject, we hope to make the subject of a com- 

 munication in the near future. 



The expenses in connection with this work were defrayed by means of 

 a grant made by the Government Grant Committee of the Eoyal Society, for 

 which we take this opportunity of expressing our thanks. 



