58 
SELECTED ARTICLES. 
have the greatest atomic weight of all the organic matters 
known at the present time. 
Dr. Muller, of Kaisersluntern, has already employed with 
success, the cetrarine in one case of quartan, and in another 
of tertian intermittent fever. 
The following is the formula : 
Cetrar. 
Gumm. Arab, aa, gr. ij. 
Sacch. alb. 9 ss. 
M. F. pulv. D. tal. dos. viii. 
Take one dose every two hours during the apyrexia. 
This substance appeared to him to act with more slowness 
than quinine, but to have this advantage, not to affect the 
stomach. Its price should be much less than quinine, since 
M. Herberger has been able to obtain from one pound of 
the lichen, 135 grains of very pure cetrarine. Salacine, as is 
known, is given in much greater doses. 
Joum. de Pharmacie, 
ART. XML—OBSERVATIONS ON THE PROCESS OF JAMES 
MARSH, FOR THE SEPARATION OF SMALL QUANTITIES 
OF ARSENIC FROM MIXTURES CONTAINING IT. 
M.M. F. Mohr and J. Liebig, the editors of the Annales 
de Pharmacie, have repeated the process of Mr. Marsh, and 
have obtained results similar to those announced by that 
chemist. The following are their observations on this im- 
portant subject. 
OBSERVATIONS OF M. MOHR. 
The method pointed out by Mr. Marsh to separate at once 
arsenic, in the metallic state, from liquids, is completely 
established; and, in fact, is too surprising not to deserve con- 
