100 CEREBRINE. 



Cerebrine (Miiller), C 17 H 33 N0 3 . 1 . Brain is made into 

 a thin milk with excess of baryta water (or lead acetate 

 solution), heated till it coagulates, the coagulum boiled 

 with alcohol, and the solution filtered hot. The volu- 

 minous white flaky precipitate which forms on cooling, 

 is exhausted with cold ether, and recrystallized from 

 boiling spirit as long as any trace of a yellowish 

 resinous body remains insoluble on solution. The 

 product is pure cerebrine, having the following pro- 

 perties ; 



2. White, loose, very light, tasteless and inodorous 

 powder, neutral to vegetal colours, insoluble in water, 

 cold alcohol, and ether. Under the microscope it 

 consists of small, nearly globular particles. 



3. Heated on platinum foil, it turns brown, emitting 

 a smell of burnt horn, then melts and burns with a 

 red flame, leaving a black swollen charcoal, which on 

 long heating burns away entirely without residue. 



4. It is insoluble in cold or hot baryta, potash or 

 ammonia. 



5. Heated with soda lime it evolves ammonia. 



6. Unaltered in cold water, it swells up in hot to a 

 thin, light turbid emulsion, permanent on cooling and 

 unchanged by acids, alkalies, or metallic salts. On 



