JVotice, 8fC. 199 



the best quality, two and a half parts by weight, of the red 

 oxid, to four of the Prussian, blue, is the best proportion. I 

 prefer using a larger quantity of water than is directed, to aid 

 the mutual action of the Prussian blue and of the oxid of 

 mercury. 



Sixteen fluid ounces of distilled water, at the temperature 

 of 65°, will hold in solution five hundred and thirty-five 

 strains of crystalized prussiate of mercury. 



Memorandum. 



Dr. Alfred S. Monson, of New-Haven, and Dr. J. L. 

 .CoMSTOcK, of Hartford, constantly keep the Prussic Acid 

 for sale for the use of Physicians. 



On the fidelity and accuracy of these gentlemen, entire 

 reliance may be placed ; and those who wish for suppheS 

 of the Prussic Acid are, by their permission referred to them, 

 ' — Editor. 



NOTICE. 



This number, having already exceeded the size of any 

 preceding one, and containing thirty-nine pages over the 

 stipulated amount of matter, it is with great regret, that 

 the Editor is compelled to postpone many miscellaneous 

 articles which were in readiness. Among them were a No- 

 tice of the Achffiologia Americana — of Professor Gorham's 

 Chemistry — -of the Revue Encyclopedique of Paris — of Mr. 

 Brongniart's Geological opinions concerning certain Ameri- 

 can Formations, and of specimens sent by him to illustrate 

 the art of making porcelain — of the American Geological 

 Society, and of donations to it, especially of a splendid 

 one by the President, Mr. Maclure — of some original Ob- 

 servations of Professor Hare — of new Localities of Ameri- 

 can Minerals — of articles of Foreign IntelHgence, by Pro- 

 fessor Griscom — and of others, by Dr. J.-W. Webster, Sic. 

 &c. We hope to give most of them in otn- next, which 

 may be expected (D. V.) in May. 



