BY DR. LAUDER BRUNTON. 435 



22. Syntonin contains Sulphur. Dissolve some svn- 

 tonin in liquor potassce, add a drop of a solution of lead acetate 

 to it, and boil. It will become brown from the formation of 

 lead sulphide. 



23. Distinction between Alkali Albumin and Syn- 

 tonin. If a solution of alkali albuminate contains an alkaline 

 phosphate, the alkali albumin is not precipitated when the 

 solution is neutralized, but syntonin is precipitated from its 

 solutions by neutralization whether 1111 alkaline phosphate be 

 present or not. 



SYNOPSIS OP THE CHIEF A i.m MINOUS BODIES. (Hoppe-Scyler.) 



24. I. Albumins. Albuminous bodies which are soluble 

 in water, and are not precipitated by very dilute acids, alka- 

 line carbonates, NaCl, or platino-hydroeianic acid. Their 

 solutions are coagulated by boiling. 



1. S^rtuii Allnn hi. Not coagulated by shaking with ether. 

 Kendily soluble in concentrated hydrochloric acid; water 

 added to this solution causes a precipitate which is readily 

 dissolved by more water. 



2. AY/v Alhituijit. Precipitated by ether. Less readily solu- 

 ble in concentrated hydrochloric acid : water added to this 

 solution causes a precipitate which dissolves with difficulty in 

 a large quantity of water. 



25. II. Globulins. Albuminous substances, insoluble in 

 water, soluble in dilute NaCl solution. The solution is coagu- 

 lated by heat. Very dilute hydrochloric acid dissolves them 

 and converts them into syntonin. 



1. V-itellin. Not precipitated by the addition of NaCl in 

 substance to the solution until it is .aturated. 



2. J///rmj. Precipitated from its solution in dilute Nad 

 solution by the addition of NaCl in substance. 



3. Pihrimtt/i-iit'c tfuhufducfi and 



4. Fibrinoplastic ^uli,<i<inrc ( Para/globulin^ agree with myosin 

 in their reactions, but together in neutral solutions they form 

 fibrin. ^ 



26. III. Fibrins. Insoluble in water TBI* in NaCl solution. 

 In dilute acids they swell, and also in solutions of soda, though 

 to a less extent. The swollen substance is coagulated by heat. 



27. IV. Albuminates. Insoluble in water or in NaCl 

 solution. Kasily soluble in very dilute hydrochloric acid and 

 in alkaline carbonates. The solutions are not altered by boil- 

 ing. They are not precipitated from t heir solutions by neutrali- 

 zation if alkaline phosphates are present. 



1. Casein yieids potassium sulphide when allowed to stand 

 with liquor potassoe, and still more quickly when heated with it. 



