170 SYNTONINE. 



3. Evaporate the ethereal solution freed from sul- 

 phuric acid by digestion with carbonate of baryta, and 

 exhaust with water. The aqueous solution freed 

 from baryta by cautious precipitation with sulphuric 

 acid examine for lactic acid and urea (q. v.). The 

 insoluble portion will consist of fats (q. v.). 



4. Examine the portion insoluble in ether for urea, 

 uric acid, sugar, and sudoric acid. 



5. Heat a little of the sweat to boiling ; a flaky 

 precipitate of albumen will, in some rare cases, 

 appear. 



6. Evaporate to dryness, burn, and analyse ash. 



Synovia. 1. Notice appearance and alkaline re- 

 action. 



2. Dilute with two volumes of water, add acetic 

 acid till very slightly acid, and boil. A precipitate of 

 albumen will be formed. 



3. Evaporate to a low bulk at 100C. and exhaust 

 with ether. The ether on evaporation will leave a 

 residue of fat. 



4. Evaporate to dryness and burn. Analyse ash. 



Syntonine or Muscle-fibrine. 1. Wash comminuted 

 muscle with cold water till free from albumen, digest 

 with very dilute hydrochloric acid, strain, neutralise 

 the solution with sodium carbonate, and wash with 

 water the precipitate of syntonine. 



2. The reactions are similar to those of fibrine, 

 except that it is more soluble in dilute hydrochloric 

 acid. 



