90 BUTYRIC ACID. 



21. Search for amyloid matter by the process 

 described under that body. 



22. In some diseases, such as softening of the brain, 

 search for/ree glycero-phosphoric acid. This "will pass 

 into the liquids obtained by sodium chloride, process 

 6, and by baryta water, process 7. The sodium chloride 

 solution, freed from caseine and albumen, as above, 

 must be filtered, neutralised with calcium carbonate, 

 evaporated to a small compass, and precipitated 

 boiling with a sufficient volume of alcohol. Dissolve 

 the precipitate in as little cold water as possible, and 

 boil ; calcium glycero-pliosphate will separate, and must 

 be again dissolved and thrown down by boiling, finally 

 washed with a very little hot water, then with alcohol, 

 dried at 100 0., and analysed. It should contain 

 60-47 % of Ca. 



23. To obtain glycero-phosphoric acid from the 

 baryta water extract, process 7, take the mother liquor 

 of kreatine and leucine, remove urea by oxalic acid, and 

 subject the residual fluid to the treatment described in 

 the previous paragraph. 



24. The albuminous matters which remain insoluble 

 in the course of any of the processes of extraction 

 above described, will yield by chemolysis (e. g., by 

 boiling with dilute sulphuric acid) leucine, tyrosine, 

 and the other usual decomposition products of 

 albumen. 



Butyric acid. 1. Produce butyric acid from sugaj, 

 as directed under lactic acid, but allow the mixture to 

 stand five or six weeks. The calcium lactate is 



