ON HYDRARGYRI IODIDUM RUBRUM. 
113 
HYDRARGYKI IODIDUM RUBRUM. 
New York, Feb. 10th, 1852. 
Editor of the American Journal of Pharmacy ; 
Sir : — Under the article, Hydrargyri Biniodidum, the U. S. Dis- 
pensatory gives as the dose l-16th of a grain, gradually increased 
to grain l-4th. 
Under the same head, Christison's work, edited by Dr. Griffith, 
ed. 1848, gives the dose from gr. i. to gr. iv. 
Has this great discrepancy been before detected, and the error 
corrected ? Student. 
[Note. — The Profession will be obliged by the above hint. We had not 
observed the error before. Since communicating the fact to the Publishers, 
Messrs. Blanchard & Lea, they have informed us that the error has been 
corrected in the unsold portion of the edition. All who have the American 
Edition of Christison should make the correction with pen at once, and all 
Medical Journals should notice it. — Ed. Am. Jour. Pharm.J 
■REPORT ON SOLUBLE CITRATE OF MAGNESIA. 
By Edward Parrish and Ambrose Smith. 
{Read at the Pharmaceutical Meeting held February 2d, 1852.) 
At the last Pharmaceutical Meeting the subject of a new method 
of preparing Citrate of Magnesia, in the solid form, so as to be 
quite soluble, having been introduced to notice by one of the 
undersigned, it was thought deserving of further attention, and 
was accordingly referred to us for examination. 
Our knowledge of this method is derived from L'Officine, a re- 
cent French work on Pharmacy, by Dorvault, which belongs to 
the College Library, and has already been noticed in the Journal. 
This work being in a foreign language and not generally ac- 
cessible, we have translated and here insert the most important 
part of the article on the citrate previous to giving our own ex- 
periments and conclusions. 
After relating the history of the discovery and introduction of 
the magnesia lemonade, or, as we call it, the solution of citrate of 
magnesia, the author proceeds: " Until now, no satisfactory pro~ 
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