THE INORGANIC CONSTITUENTS OF THE BLOOD. 847 
canal, but chiefly in the circulation, into amido-acids and 
non-nitrogenous bodies. The latter undergo combustion and 
yield carbonic acid and water, while the amido-acids form 
urea. They think it not improbable that ammonia is liberated 
from albumin simultaneously with cyanic acid, and unites 
with it to form urea, or with cyanogen to form cyanamide, 
which is then transformed into urea. 
The urea in their experiments was determined by Bunsen’s 
method, which the authors have improved. For details the 
original paper must be consulted. Liebig’s method did not 
answer, an acetamide precipitated the murcuric nitrate as 
well as urea.— Zeitsch.f. Biologie. 
THE INORGANIC CONSTITUENTS OE THE BLOOD. 
By A. Jarisch. 
Jarisch has made (in Strieker’s laboratory at Vienna) 
analyses of the inorganic constituents of dogs’ blood with 
more than ordinary care and precautions. The blood was 
received direct from the vessel in carefully weighed and 
stoppered flasks surrounded by ice in order to avoid loss by 
evaporation. The weight was accurately determined after 
the blood had been allowed to thaw. The blood was then 
carefully evaporated, and the mass, before complete incinera¬ 
tion, digested with hot water in order to extract soluble 
chlorides, &c., and thus provide against loss of these con¬ 
stituents by strong heat. The solution was evaporated, 
incinerated to destroy organic matters, and redissolved in 
water. This solution was added to the fully incinerated 
mass, and the whole evaporated and dried. In this manner 
the inorganic constituents were obtained without loss. As, 
however, even after the most careful incineration, it is almost 
impossible to get rid of all the carbon, the results are always 
a little too high, but serious error is eliminated by comparison 
of the found with the calculated constituents. 
The ash so obtained is partly soluble in water, and com¬ 
pletely so in hydrochloric acid. The watery solution has an 
alkaline reaction. The alkaline reaction is neutralised by a 
drop or two of dilute acid, and the ash probably consists of 
neutral salts and iron oxide. The method of quantitative 
determination is fully given in the original paper. 
Tables are given of the results of four analyses, three of 
arterial and one of venous blood. The percentage amounts 
xlv. 57 
