* 
114 Scientific Intelligence. 
(Dr. Hare, who long ago succeeded in fusing iridium, found its 
21°83.) Iridium forms with tin a beautiful alloy crystallizing in: 
having the formula IrSn2 a 
he authors remark that the alloys of platinum with iridium and th 
ie 
degree of hardness and rigidity. e memoir contains in additionn 
merous elaborate analyses of different specimens of platinum ore and 
osmiridium, as well as new processes for the treatment of platinum o 
upon the larger scale, the preparation of pure platinum for indu 
purposes, and of alloys of platinum with its associate metals po 
useful properties. For these we must refer to the original—Ann 
Chimie et de Physique, lvi, 385, Aug. 1857. : 
WNote-—A memoir read before the Am. Association for the Advane 
fined in all its parts, and which may always be obtained of uniform ch 
acter. The outer cone of flame has a very faint sky-blue color 
Invisible even by feeble daylight. The inner cone of flame 18 
water, when a grain or a little of the powdered substance will 
adhere to it. 
_ The author remarks that the temperature which the flam 
of producing depends principally upon the constitution of | 
sumed. The temperatures corresponding to gas analyzed in 
berg laboratory on four different occasions were 2369 C., 23 
