34 Griswold on Submarine Explosion. 
employs, and although this fluid is liable to decompose, and 
to become weak, especially by careless keeping, these vi- 
als appear to have arrived in good order; the acid remains 
colourless, whereas it is coloured if decomposed. t was 
made in Paris, by M. Robiquet. 
Dr. Alfred S. Monson, upon whose skill and care every 
degree of reliance may be placed, will supply practitioners 
with this acid, pagina od by him corner of York an 
Elm streets, New-H 
. The vials shidue be kept lowe stopped and in a 
dark and cool place ; they should be opened as little as 
possible, should be labelled poison, and the undiluted liquid 
y no means tasted; they should be ae t where none but 
discreet persons can have access to them 
entlemen who use the prussic acid are invited to trans- 
mit their reports of its effects for publication in this Journal ; 
they shall be published either in extenso, oF by abstract, and 
analysis as may appear best. 
Piyrsic’, MECHANTES: CHEMISTRY: AND THE ARTS. 
pe ee SUBMARINE NAVIGATION. 
— Vill. Deictiption: of a Machine, savented sat cou- 
structed by Davin ten ater @ “native of Saybrook, at 
American army yt destroy some of the. British ships then 
lying at New- by Cuarrzs Gris 
won, Esq. 
ro PROFESSOR SILLIMAN, 
. ~ Lysiz, Conn. Feb. ast. 1820. 
Sir, 
Tri is to be presumed ‘that every person who has sat any 
attention to the mechanical inventions of this country, oF 
