T. S. Hunt on Volcanic Action. ee 
The density of liquid arsenite of amyl at 0° compared with 
that of water at 4°=1:0525. Arsenite of amyl, which has 
_ been purified pi distillation under a dimifished pressure, 
distils in the air at 288°-290°, but read the last part of the 
distillation arsenious acid separates ‘ou 
Arsenite of amyl is not more stable ‘than the other ethers of 
arsenious acid. It is immediately decomposed by water and 
also by the moisture of the air 
nite of amyl has analogous properties with the arsenites 
of ethyl and methyl. 
The relations between the boiling points of the bodies ee 
scribed in this Ss paper present some curious anomalies, and 
not fall within Kopp’s law derived from the study of the more 
simple ethers. 
Boiling points under a pressure of 60 millemeters : 
(C.H,)3;AsO,= 149° 
(CH,);AsO, =129° 
Difference =. 20° 
Boiling points under the atmospheric pressure: 
(C,H;);AsO,= 166° 
(CH;)sAsO3 =129° 
Difference = 37° 
In the first ae the difference of boiling point for each i incre- 
ment of CH, is 6 
In the second case the difference is 124°. 
I have already stated in a communication to the French 
_ Academy of Sciences, (April 2, 1867 A that tungstiec and anti- 
: monius a an no ethers when ey are heated with the 
silicate 
Pats Hk—On the probable wnat of ie Action ; i 
Srerry Hunt, LLD., F.RS* 
THE i igneous theory a the earth’s crust, which supposes it to 
_ have been at one time a Sisee mass, and to hes retain in its in- 
Se qonceiyed by —— to de rae ite a “emery heat of 
eses have been = t ovens. 
* From the Geological Mages for Five. 1869. 
