108 Scientific Intelligence. 
crystals of mannite, which however could not be isolated from the 
syrupy liquid, and the whole was therefore evaporated in the water 
bath. The residue obtained in this manner weighed 782 grms. and 
contained 12? per cent. lime ;. 350 grms. of this dry residue was dis- 
solved in 1200 grms. of water mixed with caseine and pulverized chalk, 
and placed in a warm chamber ; in 7 days it had become converted into 
a crystalline paste, from which were obtained on re-crystallization 210 
ms. lactate of lime. If the product of 210 grms. be extended to the 
entire residue 732 grms., this would have yielded 439 grms. of the salt, 
consequently the above 1400 grms. of sugar would have produced 
1309 grms. of lactate of lime, exclusive of loss. IL. 8 
16. Acetate of Iron,-remedy for Arsenical preparations ; by M. 
Durtos, (Ed. Phil. Mag. 1845.)—It appears from experiment that the 
hydrated peroxide of iron possesses no efficacy as an antidote where 
arsenite of-potash, (FowLer’s solution,) or arseniate of potash have been 
employed ; it only acting where the uncombined acids have been used. 
The author recommends as a substitute in this case, the peracetate of 
iron, prepared by adding acetic acid of density 1-06 diluted with two or 
three parts of water, to the hydrated peroxide of iron prepared in the 
ordinary way, (there should be an excess of peroxide.) ‘This prepara- 
tion is administered largely, diluted with water, it being thus much more 
efficacious. J. L. 8. 
17. Analysis of the Tungstates; by M. Manrquenite, (Comptes 
Rendus, Feb. 1845.)—To the salt to be analyzed, is added several 
times its weight of pure sulphuric acid, (in a platinum cruicible,) which ~ 
is at first heated gently, and gradually raised to a red heat; the residue 
which consists of an acid sulphate and free tungstic acid, is thrown 
upon a filter, and washed with water charged with sal-ammoniac, by 
this means the tungstic acid is prevented from combining with the wa- 
ter and traversing the filter; after the washing is completed, the filter 
and its contents are ignited and weighed. J. 
18. Test for Nitric Acid ; by E. G. Scuwerrzer, (Proceed. Chem. 
Soc. Jan. 1845.)—It became necessary in the examination of the Bon- 
nington mineral water, to test for nitric acid where bromine and iodine 
were present. It is known that if any fluid, containing even a very 
small quantity of nitric acid, be concentrated, and mixed witha little 
pure sulphuric acid, that a concentrated solution of the protoxide of 
iron when added affords a pink color ; when the quantity of nitric acid 
is greater, the color became brown or black. The effect of this test, 
{sulphuric acid and protosulphate of iron,) upon salts of iodine 
: an bromine, is to tinge the liquid with the peculiar color of these two 
abstances, but an excess of the protosulphate destroys the colors, 
ch is not the case with nitric acid. The author states that whege the 
We 
