trace of it | 
48 F. W. Clarke on a new method 
action in the crater seems to have been the formation.of the 
cinder cones in the southwestern part. 
To conclude, the survey has impressed me with the convic- 
tion that this is a real terminal crater, and not merely ‘a -_ 
gorge open at the north and east,” or a caldera. I have inde 
heard the theory proposed that the mountain is but the wreck 
of a complete dome with a small terminal crater, the whole top 
of which has fallen in and been carried away, as is supposed to 
have been the case with some of the volcanoes of J ava, and 
the Caldera of Palma. Such questions I leave for geologists to 
setile, and if I can furnish them any new data on the subject, 
I shall be quite content. : 
Oahu College, Oct. 12, 1869. 
Art. VL—On a new method of separating Tin from Arsenic, + 
Antimony, and Molybdenum ; by Frank WiIG@LESWORTH 
CLARKE, S.B. : 
verted into the insoluble, crystalline stannous oxalate, while 
the yellow disulphid is completely dissolved. The commercial 
“mosaic gold,” } 
he sulphids of arsenic, even upon very long boiling with 
the acid, are almost unattacked. Ve. minute traces of the 
€ sulphid of antimony behaves in a somewhat different 
manner. Although upon long boiling with oxalic acid consid- 
able quantities of the metal are taken into solution, yet every 
ma eprecipitated by H,S. 
pears Se be wholly unattacked by 
tained discordant 
sem to be wholly 
