512 Scientific Intelligence. 
the same temperature by immersing the wire in a bath of melted 
stearine. From these observations he obtains the following con- 
clusions :— 
ist. The galvanic current produces no other modification in the 
elasticity of a conducting wire than that due to the elevation of 
of heat. 
The ratio of the expansions produced by heat and electricity 
equals for platinum, 25; for copper, 15; for soft iron, ‘22; for 
ard iron, ‘13; and for hardened steel, in one case —*01.—Bibi. 
Univ., 194, p. 148. . hF, 
10. nium Photometer.—The Eart or Rosse has made some 
