CYSTINURIA 519 



Bence-Jones' Protein 0.6% 



Proto-albumose 0.7 



Hetero-albumose (Witte's peptone) 4.1 



Edestin (from hemp seed) 0.3 



Crystalline globulin from squash seed 0.3 



Protein from fir-tree seed ' 0.3 



Gliadin from wheat 0.5 



Caseinogen (cow's milk) 0.1 



Caseinogen (cow's milk) : . . . . ? 



Koilin 0.8 



Egg membrane from Scyliium stellare ? 



ISTeurokeratin 1.5 



Whalebone of North Whale 4.2 



Carapace of tortoise 5.2 



Keratin from ox horn 6.8 



Keratin from sheep's horn 7.5 



Keratin from sheep's wool 7.3 



Keratin from horse's hair '. . 8.0 



Keratin from egg membrane 7.G 



Crystalline protein from Antmris toxicaria 10. G 



Van Slyke determined the cystin nitrogen in various proteins and 

 he gives the following figures expressed in percentages of total nitrogen : 



Protein Cystin Nitrogen 



Gliadin (wheat) 1.25% 



Edestin 1.49 



Keratin (dog's hair) G.60 



Gelatin 0.00 



Fibrin 0.99 



Hemocyanin 0.80 



Hemoglobin 0.00 



Buchthala in his analysis of various substances rich in keratin ob- 

 tained the following amounts cystin (expressed as per cent of total) : 



Human hair A 14.03% 



B 12.98 



C 14.54 



Human nails 5.15 



Horse hair 7.98 



Horse hoofs 3.20 



Cow's hair 7.27 



Cow's hoofs 5.37 



Hog's bristles 7.22 



Hog's hoofs 2.17 



