344 SOLID PARTS OF ANIMALS. 



sublimate, nitrate of silver, nitrate of cobalt, cyanodide of mer- 

 cury, chloride of iron, chloride of barium, sulphate of potash, 

 iodide of sodium, hydriodate of ammonium, acetate of copper, tar- 

 tar emetic, borax, nor persulphate of iron. 

 It was analyzed by Mulder, who obtained 



Carbon, . 47-5735 



Hydrogen, . 6-0660 



Azote, . 16.3210 



Oxygen, . 30-0395 



100-0000 * 



To form an idea of its atomic weight, he precipitated it by di- 

 acetate of lead. The white precipitate, washed and dried at 248, 

 was composed of 



Gelatin, i- 56-61 or 18-26 



Oxide of lead, , 43-39 or 14 



100-00 



If we consider the compound as a digelate, the atom of gela- 

 tin will be 36.52. Hence he considers .the constitution of the 

 gelatin from silk to be 



23 atoms carbon, = 17 '25 or per cent. 47*18 



17 atoms hydrogen, = 2-1875 ... 5-98 



3 J atoms azote, = 6-125 ... 16-75 



11 atoms oxygen, =11-000 ... 30-09 



36-5625 100- 



If we compare these constituents with those of collin obtain- 

 ed from skins and isinglass, as analyzed by Mulder himself, and 

 which have been given in a preceding chapter, it will be obvious 

 that the constitution is not the same. But it is possible that this 

 difference may arise at least in part from our ignorance of the 

 true atomic weight of collin. The subject requires and deserves 

 farther investigation. 



3. The substance to which Mulder gave the name of albumen 

 is friable and specifically heavier than water. On a red-hot iron 

 it is charred with the smell of horn. It burns with flame, leav- 

 ing behind it a great quantity of white ash, consisting chiefly of 

 carbonate of soda. When distilled per se it gives out much car- 



* Poggendorf s Annalen, xl. 288. . 



