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The Compound Blowpipe. 97 
Arr. XXIV. On the Compound Blowpipe-—Extract from the 
Journal de Physique, of Paris, for Jan. 1818.* 
Concernine Heat. 
Hear, considered as one of the most important agents, es- 
pecially in relation to chemistry, and even to mineralogy, has 
also been the subject of numerous labours, both with regard to 
the means of augmenting and of diminishing its effects. 
To the former belong the numerous experiments made, espe- 
cially in England, with the blowpipe, supplied by a mixture of 
oxygen and hydrogen gases. Mr. Clarke has evidently been 
more extensively engaged in these researches than any other 
Person, as our readers have perceived in the extracts which we 
have given from the labours of this learned chemist; but it is 
proper also to give publicity to the protest (réclamation) made 
tous in favour of Mr. Silliman. 
We have already stated that Mr. Hare, of Philadelphia, first 
conceived the idea of forming a blowpipe with explosive gas ; 
itas wé have not been conversant with the Memoirs of the 
Society of Arts and Sciences of Connecticut, we have not made 
Mention of Mr. Silliman. 
_ The fact is, that this chemist, Professor at New-Haven, pub- 
lished, on the 7th of May, 1812,+ a memoir, containing the re- 
sults of experiments made upon a very great number of bodies, 
until that time reputed to be infusible ; and, among others, upon 
the alkaline earths, the decomposition of which he effected. 
€ experiments of Mr. Clarke were therefore subsequent; 
but, having been made upon a still more extensive list of sub- 
stances, they are scarcely less interesting. 
It results, then, from the experiments of Messrs. Hare, Silli- 
man, Clarke, Murray, and Ridolfi, that there is really no sub- 
stance which is infusible in the degree of heat produced by this 
kind of blowpipe. 
: In this new department of physics, it is attempted not only 
{ apply the blowpipe to a very great number of bodies, but 
“Communicated by a friend at Paris. 
vy. See Transactions of the Connecticut. Academy, and Bruce’s Journal, 
ol. I, p. 199, 
Vor. L...No. 1. 13 
