ANIMAL AMIDES. 



Chloroproteic acid is soluble in barytes water. If no heat be 

 applied to the solution, carbonic acid may be passed through it. 

 If we then heat and filter it we have a colourless solution, which, 

 when evaporated, leaves a residue containing organic matter, 

 barytes, and chlorine. Chloroproteic acid is soluble in ammo- 

 nia with the evolution of much azotic gas. When the solution is 

 evaporated we obtain a residue soluble in hot water. Alcohol 

 throws down from this solution a new organic matter, while sal- 

 ammoniac remains in solution. Mulder distinguishes this new 

 organic matter by the name of Oxyprotein. 



It is a yellow powder which must be treated with boiling alco- 

 hol to free it from the ammoniacal salt : and it always retains a 

 small quantity of chlorine. Mulder dried it at 212, and subject- 

 ed it to an ultimate analysis. 603 parts of it gave 1108 of car- 

 bonic acid, and 358 water. 100 parts gave 15*12 of azote. 

 Hence the constituents are, 



Carbon, . 50-16 



Hydrogen, . 6.50 



Azote, , 15.12 



Oxygen, . 28-22 



100-00 



He represents the constitution by the formula C 40 H 31 Az 5 

 O 15 -f HO. It is therefore a hydrated oxide of protein ; or 

 protein combined with three atoms water. The chloroproteates 

 when they lose their chlorine by the action of ammonia do not 

 lose the oxygen of the chlorous acid, which forms with the pro- 

 tein a new body. 



Oxy-protein constitutes a brittle and easily pulverized mass, 

 having an amber colour. It is heavier than water and soluble 

 in that liquid. It is scarcely soluble in alcohol and quite in- 

 soluble in ether. It dissolves in dilute sulphuric acid at a boil- 

 ing temperature. Strong boiling muriatic acid dissolves it also 

 without becoming coloured. By nitric acid it is converted into 

 xanthoproteic acid. It is soluble in potash, soda, ammonia, and ba- 

 rytes water. The aqueous solution is not precipitated by prus- 

 sic acid. Sulphuric acid throws down a white precipitate, which 

 dissolves when the liqour is heated, and again falls when it cools. 

 With infusion of nutgalls it gives an abundant precipitate. Ni- 



