= * nF *e, 
y &** 
= $ 
* Png of the ad Assocition. 
it was rare, and. gle xg sold at £10 each.—Prof. Andrew 
Buchanan telated te method arating, by filtration, the co- ‘ 
blood.—Dr. Clark, of Aber- — 
a pais portions of arsenic.— 
tainin. expériments made by him 
while resident in ee firmar of Glasgow, which showed 
that the per centage carbonic acid thrown off from the lungs 
is greater in disease than in health:—A paper by, Messrs. Redten- 
bacher and Varrentrapp was read, on the constitution and products 
of the distillation of fat bodies. Prof. Bu stated his new 
mode of estimating nitrogen in organic analysis. He introduces 
the substance to be analyzed, after having mixed it with oxide 
of copper, into a glass tube. A few r slips of metallic copper are 
then added, and the tube is fixed to Dobereiner’s apparatus for 
producing ny deqpes ~ This gas is conducted through it until all 
the atmospheric air is expelled, giving the tube at the same time, 
a rotary motion, in order to dislodge any air which might be re- 
tained between the particles of the oxide of copper. The tube 
is now hermetically sealed, and introduced into an iron vessel, 
__ filled with moist gypsum. Thus prepared it is introduced into 
he common oven used for organic analysis, and surrounded with . 
red-hot coals. If the tube is of strong green glass, it never b ie 
When the combustion is completed, the tube is placed Ait 
graduated glass receiver standing over mercury, and the point cut ~ 
off. The gas, which had a pressure of several atmospheres, now 
rushes into the jar. The carbonic acid is absorbed by a ball a 
hydrated potash, which is introduced into it, and the remaining: — 
gas must be nitrogen, for all the hydrogen must have been pn a : 
verted into water by the oxygen of the oxide of copper. Th x 
results obtained by this method agree with theory to the second 
and often to the third decimal place.—Prof. Penny gave an ac- 
count of a new salt obtained from iodine and caustic soda, which” 
he names the sesquiodide of iodate of soda.—Prof. Johnston read 
a paper on resins, containing the following results. 1. The resins 
differ from each other in the quantity of oxygen they contain. 
2. Those in which the atoms of oxygen is the same, may vary 
in the hydrogen, which is another cause of difference in properties. 
3. In all the song hitherto analyzed, the number of atoms of car- 
bon is constant. 4. The resins, as a natural family, may be rep- 
resented by a . formula containing two variables. 5. The 
