ek Ne a a i, i 
“ a . * * ‘ ge + * % 
52 
lings 5 the British Association. . 
and is almost cl in volume to ha ft ae solution. When the 
_ solution is less concentrated, there is at first no precipitation, but 
~ as the liquor cools open needles ap ar, and at a certain point a 
~ large mass of precipitate is suddenly formed. 'The peculiarity of 
this process is, that it affords a well | ‘96 aR and fine product 
of morphine, without the use of:alcoholy .This is due to the 
fact that the ammonia is not added in 1 free state, but is genera- 
ted in immediate contact with: the ae: to be acted upon. 
The morphine is nearly colorless: by dissolving it in muriatic 
acid, and crystalliz we obtain ‘pure muriate of morphine in 
white crystals. The milk of lime, it is to be observed, must not 
be added to a boiling hot solution of the crude opium, for then 
the precipitate adheres to the sides of the vessel, and does not af- 
terwards 2B perfectly. The liquor containing the mor- 
phine should t be cold or only lukewarm, when the milk of 
lime is added to it. If it is boiling hot, it must be mans to the ~ 
milk of lime, and not vice versd. 
. Schafhaeutl read a paper on anew method of photogenic 
drawing.—Prof. Graham gave an abstract of Prof. Liebig’s new 
chemical views relative to Agriculture and Physiology.—Prof. 
Playfair read.a statement of Prof. Liebig’s new views on bee 
_, subject of poisons.—Dr. P. gave an account of a new fat acid.— 
* Mr. J.J. Griffin read a paper on a new method of crystallographic 
notation. He classes the planes of crystals into seven elementary 
_ sets; which he calls forms; and entered into various details to 
"prove that.the occurrence of planes not representable by one or 
* other of these seven forms, is a mathematical impossibility, and 
that the proposed system of notation is amply sufficient for all 
the purposes of the chemist and mineralogist, while it has over 
other systems of crystallography, the advantage of requiring but 
asmall amount of mathematical knowledge. 
~ Prof. F. Penny communicated details and results of his exper- 
iments on the action of nitric acid on the chlorates, iodates, and 
bromates of potassa and soda.—Dr. R. D. Thomson gave his 
views on the tests for sulphuric acid when thrown upon the per- 
son.—Prof. Johnston stated his experiments on the resin of sarco- 
colla.—Prof. 'T. Thomson enumerated the minerals found in the 
neighborhood, among which were nine species of lead ore, and 
numerous minerals of the zeolite family. Sulphuret of cadmium 
had been lately discovered along with prehnite, at Bishoptown: 
