604 ORGANS OF GENERATION. 



equal volume of a saturated solution of ammonium sulphate, but are 

 precipitated on adding more salt thereto. The substance is not pre- 

 cipitated on boiling, but the part which has become insoluble in cold 

 water and which has been dried, is dissolved by boiling water. ZANETTI 

 has prepared glucosamine on splitting ovomucoid with concentrated 

 hydrochloric acid, and SEEMANN found that the quantity of glucosamine 

 in ovomucoid was 34.9 per cent. 1 



Ovomucoid may be prepared by removing all the proteins by boil- 

 ing with the addition of acetic acid and then concentrating the nitrate 

 and precipitating with alcohol. The substance is purified by repeated 

 solution in water and precipitation with alcohol. 



PANORMOW believes that the eggs of other birds, such as the pigeon and 

 ducks, contain a special protein in the egg-white, which is not identical with 

 that of the hen's egg. WORM 2 has prepared a crystalline albumin from white 

 of the turkey eggs which contained 15.37 per cent N, 1.6 per cent S and had a 

 specific rotation of ()D= 34.9. 



The mineral bodies of the white of the egg have been analyzed by 

 POLECK and WEBER. 3 They found in 1000 parts of the ash: 276.6- 

 284.5 grams potash, 235.6-329.3 soda, 17.4-29 lime, 17-31.7 magnesia, 

 4.4-5.5 iron oxide, 238.4-285.6 chlorine, 31.6-48.3 phosphoric acid (P 2 5 ), 

 13.2-26.3 sulphuric acid, 2.8-20.4 silicic acid, and 96.7-116 grams carbon 

 dioxide. Traces of fluorine have also been found (NiCKLES 4 ). The 

 white of egg contains, as compared with the yolk, a greater amount of 

 chlorine and alkalies and a smaller amount of lime, phosphoric acid, and 

 iron. 



The Shell-membrane and the Egg-shell. The shell-membrane consists, 

 as above stated (page 112), of a keratin substance. The shell contains 

 very little organic substance, 3665 p. m. The chief mass, more than 

 900 p. m., consists of calcium carbonate; besides this there are very 

 small amounts of magnesium carbonate and earthy phosphates. 



The diverse coloring of bird's eggs is due to several different coloring-matters. 

 Among these we find a red or reddish-brown pigment called " oorodein " by SORBY, S 

 which is perhaps identical with haematoporphyrin. The green or blue coloring- 

 matter, SORBY'S oocyan, seems, according to LIEBERMANN 6 and KRUKENBERG/ 

 to be partly biliverdin and partly a blue derivative of the bile-pigments. 



1 Zanetti, Chem. Centralbl., 1898, 1; Seemann, cited from Langstein, Ergebnisse 

 der Physiol., 1, Abt. 1, 86. 



2 Panormow, see Bioch. Centralbl., 5; Worm, cited from Chem. Centralbl., 1906, 

 2, 1508. 



3 Cited from Hoppe-Seyler, Physiol. Chem., 778. 



4 Compt. rend., 43. 



5 Cited from Krukenberg, Verh. d. phys.-chem. Gesellsch. in Wiirzburg, 17. 



6 Ber. d. deutsch. chem. Gesellsch., 11. 



7 I.e. 



