170 Miscellaneous Intelligence . 



left in the air, it slowly attracts nitrogen, and becomes of a rose 

 colour, but if left too long, it blackens and becomes mouldy. If 

 then put into water, it resumes itspurple colour, and when, by stand- 

 ing, it has fallen to the bottom, the water has a chesnut brown tint, 

 from which, some foreign matter is suspected to give colour to the. 

 eritrogene, and the pure substance is supposed to be colourless. 



Until now, nothing has been said of the nature of the azotated 

 eritrogene ; but M. Bizio at last states it to be precisely the same 

 substance as the colouring matter of the blood, having presented, on 

 the most scrupulous examination, all the physical and chemical 

 characters belonging to that body. 



In some further remarks upon the coloration of the blood, M. 

 Bizio states his opinion, that eritrogene, or something very like it, 

 and ready to become eritrogene, exists in the chyle ; and that, when 

 this reaches the lungs, nitrogen is absorbed as well as oxygen, and 

 colour given to it. He remarks, that though he had been unable to 

 find eritrogene in the chyle, yet the researches of Vauquelin, Brande, 

 Marcet, Emmert, Dupuytren, c, have shewn, that a fatty matter, 

 soluble in alcohol, exists in the chyle, and that chyle may be con- 

 sidered, as Thenard has said, blood minus the colouring matter, and 

 plus the fatty substance. Marcet remarks, that the coagulum of 

 chyle is opaque, and has a rose tint, perhaps due to some particles 

 of eritrogene azoiated by the air. The author, however, supports his 

 opinion with modesty, and hopes, that ere long, further light will be 

 thrown on this subject. — Gior. di Fis. vi. 446. 



28. Compounds of Cystic Oxide. — The following is the composition 

 as ascertained by M. J. L. Lassaigne, of certain compounds of cystic 

 oxide. Its compound with muriatic acid is crystalline, but always 

 distinctly acid: when dried in the sun, and decomposed by carbonate 

 of ammonia, it gave 



Cystic oxide .... 94.7), ft0 



Muriatic acid .... j.3J 



The compound with nitric acid crystallized in needles with a bril- 

 liant nacreous aspect. It gave 



Cystic oxide . . . 96.9~l tnn 



Nitric acid . . . 3.1J 1U 



The sulphate of this substance is a viscid colourless substance, 

 soluble in water, and uncrystallizable. It appeared to be com- 

 posed of 



Cystic oxide . ... ^•^lino 



Sulphuric acid .... 10.4} ' 



but it was probably not quite dry. 



The oxalate crystallizes in needles, which effloresce in the air, it 

 contains 



Cystic oxide . . . . . . 78 



Oxalic acid ...... 22 



