174 Dr Latham, On the Composition of Albumen. [Feb. C, 



which, treated with hydrochloric acid, gives mandelic acid* — 



xL N+ 2H a O = C,H,.CH{ co()H 



H 5 .CH |^ 



mandelic acid 



and mandelic acid oxidised is converted into benzoic acid-f* — 



OH 

 COOH 



benzoic acid 



aH^CH-i^^ + O, - C 6 H 6 .C0 2 H + C0 2 + H 2 



8. Sulphur exists as an animal product in the form of a 

 sulphite in taurine, and the acid sulphites of the alkali metals form 

 crystalline compounds with the aldehydes £. 



9. Taurine, a product of the animal organism, may be ob- 

 tained in the laboratory by heating ammonium isethionate to 

 210°— 220°C.§— 



CsHi {s0 3 NH 4 = C ^ {s0 3 H + Ha ° 

 ammonium isethionate Taurine 



Isethionic acid being obtained from the oxidation of ethene mono- 

 thiocyanate or ethene mono-thiohydrate|| — 



C 2 H 4 | SH + 3 = C 2 H 4 | g0gH 



ethene mono-thiohydrate isethionic acid 



° A IONS + °3 + 2H *° = °A {g H + C0 2 + NH, 



ethene mono-thiocyanate isethionic acid 



10. On decomposing albumen it yields tyrosine (a para- 

 derivation of benzene), and a much larger percentage of leucine. 



11. Some compounds of cyanogen by condensation of three 

 molecules form new compounds. 



3CNOH = C 3 N 3 3 H 3 

 cyanic acid cyanuric acid 



Fowues, p. 537. f lb. p. 538. J lb. p. 248. 



§ lb. p. 173. || 76. p. 173. 



