Real and supposed effects of igneous action. 345 
Silica and alumine, in very smell bia dias 
Carbonic acid gas, 304 cubic inches 
Atmospheric air, = - - - - a 
Gaseous contents in a gallon 309 
pecific gravity of the water at the temperature of 60° is 
1006.85, pure water being 1000,* and its temperature at the 
bottom of the rock is uniformly 48° Fahr. 
Art. XXI,—Real and supposed effects of igneous action. 
[.—Letters from the Sandwich Islands ; by Jostrn Goopricn, 
If.—A letter from Mexico ; by Wituiam Macuore. 
I. Mr. Goopricn’s Lerrers. 
Remarks. 
Iw a note to an account of the volcanic character of the 
island of Hawaii, published in Vol. XI. of this Journal, men- 
tion is made of a box of minerals destined for the Editor.— 
that creat alterations are taking place at the bottom; it is 
filling up gradually, and slight bets of earthquakes oceur 
here frequentl 
The acdc that are at the upper part of the cask, I col- 
lected upon the summit of Mouna Kea. Some of them appear 
to me to be fragments of the granite rock. The shells that 
are with them, the largest is from the Gulf of California ; the 
remainder are from this island. The volcanic specimens in 
gh of the Hamilton rtee Fa water (left blank, p- 245) is, as we 
* The 
since lesen j water being 1 
+ Which is sppblished in in Vol. XI. p. “ “tA magnificent pearl oyster. 
. XVI.—No. 17° 
Vor 
