at sea.--The construction of larger ones discussed.


VIII. ORDNANCE.--Firing Trial of the 110½ Ton B.L. Elswick Gun.
Full dimensions of this piece and it projectiles.--Results of proof
firing.--9 illustrations.


IX. PHOTOGRAPHY.--Experiments in Toning Gelatino-Chloride
Paper.--Trials of ten different gold toning baths, formulas,
and results.

Printing Lantern Pictures by Artificial Light on Bromide Plates
from Various Sizes.--By A. PUMPHREY.--The processor producing
smaller or larger transparencies from negatives.--1 illustration.


X. PHYSICS.--A New Mercury Pump.--Simple air pump for high
vacua.--1 illustration.

The Laws of the Absorption of Light in Crystals.--By H.
BECQUEREL.

Varying Cylindrical Lens.--By TEMPEST ANDERSON, M.D.,
B. Sc.--Combination of two conoidal lenses.--Range of power obtained.

XI. PHYSIOLOGY.--Elimination of Poisons.--Treatment of poison
cases by establishment of a strong diuresis.
The Filtration and the Secretion Theories.--Experiments on the
action of and secretions of the kidneys.