Physics and Chemistry. 109 
It is only necessary then to pass a continuous and rapid current of 
air through the solution upon the filter, to maintain the globules in the 
proper condition. The blood as soon as drawn is defibrinated, mixed 
in the saline solution, and thrown upon a large filter. tube in the 
point drawn out introduces the current of air, which also keeps the 
globules suspended—if they adhere to the filter they are no longer aér- 
ated e solution is renewed as fast as it filters off. In this way the 
globules are obtained perfectly free from serum. ‘The process should 
be conducted as expeditiously as possible. 
Thus the globules of the blood seem to possess vitality, as they can 
resist the solvent action of sulphate of soda as long as their life con- 
tinues, but yield to this action readily when they have fallen into asphyx- 
ia from privation of air. 
hosphate of soda and salts of organic acids are among those which 
st preserve the power of aération in the blood corpuscles. On the 
moniac, prevent the aération of the globules even in oxygen. Salts of 
potash seem to have less of the preservative effect, than salts of soda. 
Dumas asks if there is any relation between these effects and the sup- 
posed liability to scurvy from the immoderate use of salt meat, or the 
poisonous effects of ammoniacal salts. 
It appears from these experiments that even in the midst of a supply 
of air or oxygen, asphyxia may result simply from the introduction 
of salts which modify the action of oxygen upon the globules. Sev- 
eral curious points are suggested as subjects for experiment. ; 
_In conclusion, an analysis of the carefully purified blood globules is 
given—the results are, for those taken from the blood of a woman, car- 
17:2; oxygen, 20°6—showing that 
bon, 55:1 ; hydrogen, 7:1; nitrogen, 
Oo. 8. 
7. New Saccharimetric Process; by M. Eve. Peticor, (Comptes 
Rendus, June, 1846. )—Peligot’s method of estimating the quantity and 
kind of sugar, either solid or dissolved, or in vegetable juices, is unlike 
all others hitherto proposed. It is founded on the property the sugars 
possess of forming definite compounds with alkaline bases, and also upon 
the rapid conversion of grape sugar into acids by the action of alkalies, 
poured a second time into the filter, in order that the whole quantity of 
lime that the sugar can take up should be immediately dissolved. 
of tincture of litmus are added, and the liquid is neutralized exactly by 
@ normal solution of sulphuric acid. This solution should contain per 
litre, 21 grammes of pure monohydrate of sulphuric acid—one litre sat- 
urates the lime dissolved by 50 grammes of sugar. Simple inspection 
etermines the quantity of the lime, and even of the sugar, if the di- 
vision has been made for the purpose. 
