REPORT ON CHEMISTRY. 
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There does not, however, appear any reason to suppose that 
the colouring-matter and the albumen are chemically combined. 
The term globuline, therefore, has not come into use, and the 
colouring-matter freed from albumen is generally distinguished 
by the term liematosine . 
Colour of the blood. —A fact of great interest to the physio- 
logisthas been stated by Dr. Stevens in his Treatise on the Blood, 
and confirmed by Dr. Turner ( Chemistry , p. 903), and others 
who have repeated the experiment. If perfectly florid arterial 
blood be allowed to coagulate, and the clot be washed with re¬ 
peated portions of pure water, its colour gradually darkens so 
as at last to appear quite black. Exposure to the air does not 
restore the colour, but a solution of common salt, carbonate of 
soda, and other neutral salts, restore it to the original colour of 
arterial blood. Hence Dr. Stevens concludes, “ that the florid 
colour of arterial blood is not due to oxygen, but to the saline 
matter of the serum.” 
Manganese in the blood .—Wurzer* has found peroxide of 
manganese in the blood, in quantity equal to one third of the 
weight of the peroxide of iron. The ashes of the colouring-mat¬ 
ter are dissolved in muriatic acid neutralized by ammonia and 
precipitated by succinate of ammonia, by which the iron and the 
phosphate of lime are both separated. Carbonate of soda pre¬ 
cipitates the manganese, which, heated to redness, and treated 
with nitric acid, gives peroxide. 
Volatile principle in blood.— M. Barruel states that the blood 
of animals has in each case a peculiar smell by which it may be 
recognised. This smell is stronger in the male than in the fe¬ 
male, and is probably due to the presence of some volatile prin¬ 
ciple. Zenneckf has investigated the subject, and confirmed 
Barruel’s statement that such smell is evolved when the blood 
is mixed with sulphuric or phosphoric acid ; he finds the detec¬ 
tion of it, however, to be very difficult. 
Albumen. —Bourdois and Caventou observed some years ago 
that cheese, albumen, fibrin, and mucus, are dissolved in the 
cold by concentrated muriatic acid; and if kept at a temperature 
between 60° and 70° F. for 24 hours, gradually assumed a beau¬ 
tiful blue colour. This fact has since been controverted, but it 
has also been confirmed by several chemists. Robiquet observes 
that heat is not indispensable, but that a large quantity of acid 
is necessary to produce the effect. Nitric acid gives a yellow, 
and sulphuric acid a reddish brown. Dr. Hope has obtained 
from albumen in the latter acid a beautiful red solution. 
Bile .—Perhaps the most important additions which animal 
* Neues Jahrbuck, i. p, 481, 
f Geiger's Mag. xxxiii. pp. 68, 172. 
