844 The American NaUiralisL [September, 
Recent Progress in Storage Batteries. — 10 min. — By George F, 
Barker. 
A Mode of Suspension for Foucault's Pendulum.— 5 min.— By R. 
B. Fulton. 
A Modification of the " Pascal's Vase " 'Experiment.— 3 min.— By 
A. L. Arey. 
Experiments for Demonstrating that the force of a Detonating Ex- 
plosion is exerted in all directions about the explosive center. — 5 min. 
— By C. E. Monroe. 
Effects of Electrostatic Discharges on Photographic Plates.— 10 
min.— By Thomas French, Jr. 
A Meuntain Study of the Spectrum of Aqueous Vapor. — 25 min.— 
By Charles S. Cook. 
An Exhibition of Photographs, taken in 1864, of the Living Eye 
{a) The retinal vessels ; {F) The retinal inverted image of an object 
placed in front of the eye.— 8 min. — By A. M. Roseburgh. 
An Exhibition of Photographs of the Fundus of the Eye of the Cat 
taken while under the influence of Chloroform.- 5 min. — By A. M. 
Roseburgh. 
Experimental Determination of the Periodic Pulsations of a Ther- 
mometer made of the new " Jena " glass.— By Wm. A. Rogers and J. 
B. Webb. 
)id Ammonia. — 50 min. — By Robert 
Molugrams and Molugram Liters.— 2 min.— By Chas. E. Monroe. 
The Explosiveness of the Celluloids.— 10 min.— By Chas. E. 
Monroe. 
fThe Chemical Composition of the Mica Group — 40 min.— By F. 
W. Clarke. 
Spectrum Photography.- 40 min.— By R. Hitchcock. 
New Botde for Hydrofluoric Acid.— 5 min.— By Edward Hart. 
Some Peculiarities of Butter.— 20 min.— By H. W. Wiley. 
Composition of the Seed of Calicanthus flaunts (Illustrated).— 20 
min.-H. W. Wiley. ^ 
The Action of Light on Silver Chloride.— 10 min.— R. Hitchcock. 
A Method of Mounting Photographic Prints on Paper.—:; min.— R. 
Hitchcock. 
Some Notes on the Estimation of Nitrogen by the Kjeldahl Method. 
—10 mm.— M. A. Scovell. 
