284 Prof. H. Rose on the Inorganic Constituents 



The components of the subject of the second analysis, as 

 obtained in the three operations, were — 



Chloride of potassium . 2567 



Chloride of sodium . . 8*57 



Potash 5-4.3 



Soda 12-49 



Lime 6-25 



Magnesia 7-03 



Peroxide of iron . . . 2-09 



Phosphoric acid . . . 15'28 



Sulphuric acid . . . 0-84' 



Carbonic acid .... 90 1 



Silica 7-05 



99-71 



In accordance with these investigations, the white of hen's 

 eggs, although decidedly a proteine substance, must be enu- 

 merated amongst the almost teleoxidic substances. The large 

 quantity of silica in the white of egg, both in the teleoxidic and 

 the anoxidic portion, is remarkable. The white of birds' eggs 

 is equally as requisite for the formation of the feathers, which, 

 according to recent investigations, contain a large amount of 

 silica, as the milk of the mammalia is for the production of 

 the bones. 



Yolk of Egg. 



Aqueous extract. — It exerted a strongly acid reaction upon 

 litmus paper, and contained a considerable quantity of the 

 earthy phosphates in solution, which were not on this occasion 

 separated, but added to the muriatic extract. The dry mass 

 fused into a transparent vitreous mass at a low red heat. It 

 consisted of — 



I. 11. 



Potash 10-38 9*77 



Soda 5-62 7-65 



Lime 11-72 11*80 



Magnesia l-4;5 2-04) 



Peroxide of iron . . . 0-59 0-95 



Phosphoric acid (undetermined) 68-74 



100-95 



The phosphoric acid formed metaphosphates with the bases, 

 excepting with the peroxide of iron. In the extract itself, they 

 did not exist in this form, but in that of acid 6-phosphates, 

 for it strongly reddened litmus paper; they were, however, 

 contained in that state in the solution of the fused residue of 



