1813.] and some other Animals, 343 



1 . Two fatty matters, which are probably identical. 



2. Albumen. 



3. Osmazome. 



4. Different salts ; and among others, phosphates of potash, 

 lime, and magnesia; and a little common salt. 



5. Phosphorus. 



6. Sulphur. 



I conceive, as far as it is possible to draw conclusions from 

 experiments so delicate, that these substances exist in the brain 

 in the following proportions : — 



1. Water 80-00 



2. White fatty matter 4*53 



3. Reddish fatty matter 0*70 



4. Albumen 7*00 



5. Osmazome 1*12 



6. Phosphorus 1*50 



7. Acids, salts, and sulphur 5*15 



XOO'OO 



Sect. X. 



Putrefaction of the cerelral matter. 



A portion of brain being diluted with a certain quantity of 

 water, and abandoned to itself during a month, presented the 

 following phenomena. At first it separated into three parts. 

 That portion which occupied the surface was a part of the 

 matter of the brain elevated by air bubbles attached to it. The 

 portion in the middle was a yellow coloured liquid, which after 

 an interval of some days assumed a fine red colour, which it 

 retained for more than 20 days. After that period this colour by 

 degrees faded, and was succeeded by a yellow colour, more 

 intense than that which the liquid had formerly possessed. The 

 third portion, occupying the bottom of the vessel, was another 

 part of the matter of the brain. During the month that it wa? 

 allowed to remain it emitted no gaseous matter. 



The vessel containing this mixture being left open, there 

 issued out of it an invisible vapour, having a disagreeable smell, 

 somewhat similar to that of putrid cheese. Some persons com- 

 pared it to the odour of the intestines when beginning to 

 decompose. 



A paper dipped in the solution of acetate of lead being 

 exposed to this vapour assumed immediately a blackish brown 

 colour. 



The liquid in which the brain had thus putrified was sensibly 

 alkaline) at least it restored the colour of litmus paper reddened 



