554 APPENDIX. 



NOTES TO VOLUME III. 



(1) Note to p. 121, line 11. [Von Bibra's Memoir is divided 

 into nine sections, which treat respectively of : 



I. The relative proportions of water, fat, and solid constituents 

 in the brain of man and animals. 



II. The fats of the brain. 



III. The water-extract of the brain. 



IV. The inorganic constituents of the brain. 



V. The amount of phosphorus in the brain. 



VI. The grey and white substance of the brain. 



VII. The brain in insane patients. 



VIII. The brain in the embryo and in extremely young animals. 



IX. The weight of the brain as compared to that of the body. 



I. From a very large number of analyses (he determined the 

 amount of fats, water, and solid constituents in more than 100 

 cases in the human brain, in 138 other mammals, in 75 birds, and 

 in 13 amphibians and fishes) he draws the following conclusions. 



1. Within certain limits the quantity of fat is constant in the 

 brain of man, as also in that of other animals. 



2. Diseases of the general system, and even such as induce a 

 diminution or disappearance of the fat in other parts, do not occa- 

 sion a diminution in the amount of the brain-fat. 



3. Fattening an animal appears to exert no special influence 

 on the amount of fat in the brain. 



4. The brain in other mammals contains less fat than the human 

 brain. Where the opposite is the case, it appears to be induced 

 by the ratio of the weight of the brain to that of the body, that is 

 to say, the smaller quantity of cerebral substance is compensated 

 for by a larger quantity of fat. 



5. The brain in birds contains less fat than the brain in 

 mammals. 



6. The brain in amphibians and fishes contains a trace less fat 

 than thiat of birds. 



