1819.) ‘ Scientific Intelligence. 309 
invention is to do“away the injury which the pillars of screens 
sustain from the rubbing of the springs in common use ; it is 
also applicable to other useful purposes. The Society awarded 
its silver Isis medal and five guineas to Mr. Bullock for this 
invention. 
ArticLte IX. 
SCIENTIFIC INTELLIGENCE, AND NOTICES OF SUBJECTS 
CONNECTED WITH SCIENCE, 
I. Carbonate of Morphia. 
In the number of the Annals of Philosophy for February, 
page 155, I gave the analysis of carbonate of morphia by 
M. Choulant. The proportions in which the morphia and car- 
bonic acid are united, according to that chemist, differ so much 
from the proportions in which morphia unites with other acids, 
according to the same person, that there must obviously be an 
error either in the one determination or the other. 
Sulphate of morphia is, according to Choulant, a compound of 
PIE che 5 aa one, & istectrnbia 
EGU 601s 6! cc's om Seieaieisrsatia's 9 
Here 9 represents the weight of an atom of morphia. By the 
acetate, it weighs 7-791; by the tartrate, 7-178; and by the 
eta its weight is 12°15; but by the carbonate, it weighs only 
I shall here state the method by means of which Choulant 
formed the carbonate of morphia in question, and his mode of 
analysis, to enable my readers to determine the degree of confi- 
dence which they may put in the results which he has given us, 
He put a drachm of pure crystallized morphia in four ounces 
of distilled water, and forced carbonic acid into the liquid by 
' pressure till the morphia dissolved, A mixture of eight parts 
dry muriate of lime and six parts snow was then placed round 
the cylindrical glass vessel containing the liquid. The carbonate 
of morphia was precipitated in crystals, and obtained pure by 
throwing the whole upon a filter. 
To analyze the salt thus formed, he put 100 gr. of it into a 
small retort connected with a Woulfe’s bottle, containmg barytes 
water. By the application of a moderate heat, the carbonic 
acid separated, and threw down the barytes in the state of 
carbonate : 22 gr. of pure morphia remained in the retort. The 
carbonate of barytes formed weighed 130°8 gr. This he consi- 
ders equivalent to 28 gr. of carbonic acid. In reality, it is 
equivalent to about 28°8 er. 
He dissolved another 100 gr. of carbonate of morphia in water, 
and added acetate of lead as long as carbonate of lead continued 
