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~A REVIEW: of some' EXPERIMENTS, 
which have been supposed to DISPROVE 
the MATERIALITY of HEAT. ° 
BY WILLIAM HENRY; 
READ JUNE 5, 1801, 
The following remarks, on the subject of heat, 
were written soon after the publication of Count 
Rumford’s Inquiry concerning the Source of the 
Heat evolved by Friction ; and of the interesting 
essays of Mr. Davy, which appeared in Dr. Bed- 
does’s West Country Contributions. They 
were transmitted to Dr. Beddoes, for publica- 
tion, about the close of the year 1799; but 
circumstances, with which I am unacquainted, 
have, I believe, induced the Doctor to decline 
the continuation of his periodical work. These 
circumstances, I deem it necessary to state ; 
because, fad -the essay been written nearer the 
period of its publication, it would probably 
have assumed a very different form. At present, 
Fhave not ‘leisure to review the subject, or to 
attempt any material alteration; and still less, 
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