IO 
connections being the same as in the above-mentioned re- 
search. 
Nos. 38-45 inclusive exhibited by Prof. M. I. Pupin. 
DEPARTMENT OF (CHEMISTRY: 
In charge of Prof. Charles F. Chandler. 
46. CARBARUNDUM. A carbide of silicon, first made by 
Edward G. Acheson. A substitute for diamond powder for 
polishing gems. Hardness inferior only to that of the 
diamond. 
47. SYNTHETIC DRUGS: 
. Anaesthetics.—Paraldehyde and others. 
. Hypnotics.——Hypnon and others. 
I 
2 
3. Antipyretics—Antipyrene and others. 
4. Antiseptics.—Aseptol and others. 
48. COLLECTION OF ALUMINIUM ARTICLES, prepared by: 
1. The Pittsburgh Reduction Co. 
2. The Illinois Pure Aluminium Co. 
3. The Scoville Manufacturing Co. 
4. The Passaic Art Casting Co. 
49. COLLECTION OF THE SALTS OF THE RARE EARTHY 
METALS. Prepared by Waldon Shapleigh, F. C. 5. Neo- 
didymium, Prasiodidymium, Lanthanum, Thorium, Zirconium, 
Erbium, Cerium, Yttrium. 
Nos. 46-49 inclusive exhibited by the Chemical Department, 
Columbia College. 
50. STUDIES IN COAL-TAR COLORS. Series of specimens illus- 
trating newly discovered dyes and their applications. 
Exhibited by Harwood Huntington. 
DEPARTMENT OF PHOTOGRAPHY. 
In charge of Mr. Cornelius Van Brunt. 
51. ELECTRIC PROJECTION LANTERN, as used by the Metro- 
politan Museum of Art. Advantages claimed: 1. Steadiness 
of illumination. 2. Mechanism of lamp positive in its action 
