TRANSACTIONS OF THE SECTIONS. 43 
i q: n the Specific Heats of Nitric Acid and Alcohol. ByT.Tuomson, M.D. 
q NITRIC ACID. 
Sp. 
Composition. Giatity, Sp. Heats. 
Atoms acid. Water. 
1 + 1:37 | 1°5040 | 0°4645 
1 + 2 14862 | 0°5138 
1 ce 1°4477 | 0°5553 
1 + 4 14177 | 0°5834 
1 +5 14005 | 0°6021 
1 6 1:3724 | 0°6415 
1 + 7 1°3598 | 0°6495 
1 + 8 1°3235 | 0°6832 
1 ae 1°3007 | 0°6941 
1 +10 1°2815 | 0°7239 
ALCOHOL 
oy Sp. 
Composition. Gravity. Sp. Heats. 
Absolute......... 0°7950 | 0°6600 
Atoms. Atoms, 
Alcohol. Water. 
1 0°8179 | 06775 
] 0°8259 | 0°7576 
1 0°8384 | 0°8034 
1 0°8672 | 0°8466 
2 09042 | 0:9210 
3 0°9266 | 0°9915 
4 0:9412 | 0°:9962 
et ete DD OO HE 
+++4++4+4+ 
. On the unequal expansion of Minerals in different directions by Heat. 
" By Proressor Mitier, FLAS. 
__ The slice of gypsum, he observed, which had been sent him by 
Prof. Mitscherlich, was a portion of a twin crystal, bounded by two 
arallel polished surfaces, cut perpendicularly to the faces f and to the 
direction of cleavage, which passes uninterruptedly through both indi- 
viduals. In consequence of the unequal expansion, in different direc- 
tions, of gypsum when heated—a fact first discovered by Mitscherlich 
—the portions of the two individuals of the twin crystal, when heated, 
alter their form; and the artificial section of the two crystals, which, 
