94. 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. ‘It was 
made in Paris, PY M. Robiquet. 
Dr. Alfred 5. Monson, upon whose skill and care every 
degree of reliance may be placed, will supply practitioners 
with this acid, manufactured by him corner of York and 
Elm streets, New Haven. 
N. B. The vials should be kept close stopped and in a 
dark and cool place; they should be opened as little as 
possible, should be labelled poison, and the wndiluted liquid 
by no means tasted; they should be kept where none but 
discreet persons can have access to them. 
Gentlemen 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, or by abstract, and 
analysis as may appear best. 
a 
PHYSICS, MECHANICS, CHEMISTRY, AND THE ARTS. _ 
5 ———D +) = 
SUBMARINE NAVIGATION. 
Arr. VIII. Description of a Machine, invented and con- 
structed by Davin BusHne.u, a native of Saybrook, at 
the commencement of the American revolutionary war, for 
the purpose of submarine navigation, and for the destruc- 
tion of ships of war ; with an account of the first attempt 
with it, in August 1776, by Ezra Len, a sergeant in the 
American army, to destroy some of the British ships then 
lying at New-York. Communicated by Cuarius Gris- 
WoLp, Esq. 
TO PROFESSOR SILLIMAN. 
Lyme, Conn. Feb. 21st. 1820. 
Sir, : 
ir is to be presumed that every person who has paid any 
attention to the mechanical inventions of this country, or 
s 
