IIEMATOSIN. 



heated to 212*, 100 hematosin only retained 6.63 of muriatic 

 acid. Hence the first was composed of, 



Hematosin, . 49.625 or 52.68 

 Muriatic acid, 6436 or 6-863 



and the second of, 



Hematosin, . 49-625 or 52-68 

 Muriatic acid, 3-29 or 3-493 



The quantity of acid in the first compound was twice as great as 

 in the second. The first compound (if we reckon the atom of 

 hemafcosin 52*68) is composed of, 



1 atom hematosin, . 52-68 

 1| atom muriatic acid, 6-9375 



The second compound retains only three-fourths of an atom of 

 muriatic acid united to an atom of hematosin. 



Hematosin combines with the metallic oxides as well as with 

 acids in definite proportions. Nitrate of silver being mixed with 

 an ammoniacal alcoholic solution of hematosin, and a little ni- 

 tric acid added, a dark brown precipitate falls. The filtered so- 

 lution is colourless, and neither contains iron nor colouring mat- 

 ter, the precipitate is a compound of hematosin and oxide of sil- 

 ver. 135 hematosin gave 22-55 of a mixture of 5-15 oxide of 

 silver, and 4-684 peroxide of iron. This compound is black, 

 has a glistening lustre, and burns like hematosin. 



It combines in various proportions with oxides of copper and 

 lead. These compounds may be formed in the same way as that 

 of hematosin and oxide of iron. 



From the preceding statement it appears that hematosin is 

 capable of combining in definite proportions, both with acids and 

 bases, though it does not neutralize either the one set of bodies 

 or the other. 



Lecanu, as has been already stated, extracted 12-67 per cent, 

 of oxide of iron from ox blood. Mulder from the blood of 

 oxen and sheep, only obtained 9*6 per cent 



Mulder has some speculations respecting the difference of he- 

 matosin in arterial and venous blood. He thinks it possible that 

 arterial hematosin may be, C 43 H 21 Az 3 O 6 + Fe 

 and venous, . C 43 H 21 Az 3 O 6 + Fe C 



and that this carburet of iron is decomposed into iron and car- 

 bonic acid by the oxygen absorbed in the lungs. 



