
oa 

1890.] Proceedings of Scientific Societies. 107 
Probable Future of Petroleum in S. W. Indiana.—C. A. Waldo. 
Observations on the Lakes of Indiana.—C. R. Dryer. 
Some Unusual Forms of Lime Carbonate Deposition.—U. F. Glick. 
The Top of the Matterhorn.—David S. Jordan. 
Stone Characters of Nyssa.—John M. Coulter. 
«Snake Cactus. ’—John M. Coulter. 
The National Herbarium.—John M. Coulter. 
Incandescent Gas Lighting.—W. DeM. Hopper. 
In the evening President Branner delivered his presidential address 
upon the subject, ‘‘ The Education of a Geologist.” Following this 
one. 
Tuesday morning, Dec. 31, the Academy convened at 9 o’ clock. 
The treasurer filed his report, which was approved, after which 7 new 
members were elected. The following paper was read in general 
session: ‘* The Effects of Trusts,” by Jeremiah W. Jenks. Follow- 
ing this it was decided by the Academy, owing to the number of 
papers to be presented, to have the sessions in two sections, one de- 
voted to Chemistry, Physics, and Mathematics, presided over by Vice- 
President Campbell; the other to Botany, Zoology, and Geology, 
presided over by Vice-President Hay. The following papers were 
presented before the former : 
Dangers of the electric circuit.—John L. Campbell. 
Apparatus for the determination of power consumption in friction 
and the cutting of metals.—Thos. Gray. 
Thomson’s portable magnetostatic electrical measuring instruments 
of long range.—Thos. Gray. 
On the determination of the elasticity constants of materials by the 
deflection method.—Thos. Gray. 
Preliminary report on the changes in density 
—Thos. Gray and C. Leo Mees. 
The use of two mirrors for the 
pansion in solids.—C. Leo Mees. 
Cause of periodicity in thermometers, as discussed by Prof. M. A. 
Rogers.—C. Leo Mees. 
Vapor densities of the volatiles metallic ‘‘ Halids.’’—P. S. Baker. 
of wires on stretching. 
determination of co-efficient of ex- 
