236 ON THE COMBINATIONS OF 
Th en, Or aie 
wee 
2321 : 1043.3 : 1: 0.4495 1 atom acid+2 atoms water 
Zoek satel. Ls O48S4 1 ee +3 s 
PeBYlonrae MAU Fadl Wt oped tends (OES ok! Nena L ie +4 “¢ 
Book datos 1 OD660) =a i +5 “ 
In consequence of the weather becoming 
much colder after I had ascertained the rela- 
tive times of cooling of the articles enumerated, 
I was unable to make experiments upon the 
remaining strengths of acid which Dr. Thomson 
experimented upon; my desire being to make 
all my cooling experiments at the same atmos- 
pheric temperature. The experiments which 
I have been enabled to make will, however, I 
expect, be sufficient for the purpose for which 
I commenced them. 
I have not myself experimentally determined 
the specific heat of oil of vitriol, or the liquid 
constituted of one atom anhydrous sulphuric 
acid and one water; but, assuming that the 
number given by Dr. Thomson is correct, the 
mean specific heats of the strengths of acid I 
have experimented upon, that is, the specific 
heats which they ought to have, as arrived at 
by calculation, if no diminution took place in 
