ion Conveyer.--An improvement on the screw of
Archimedes; an apparatus of wonderful simplicity and efficacy in
the moving of grain.--2 illustrations.

The Retiro Viaduct.--Combined iron and stone viaduct over the
river Retiro, Brazil.--5 illustrations.

Western North Carolina Location over the Blue Ridge.--Interesting
instance of railroad topography.--1 illustration.

V. METALLURGY.--Chilled Cast Iron.--The various uses of this
product; adaptability of American iron for its application.

VI. MISCELLANEOUS.--Coal in the Argentine Republic.--Note.

History of the World's Postal Service.--Conclusion of this
interesting article.--The service in Germany, China. Russia, and
elsewhere.--10 illustrations.

Snow Hall--The new science and natural history building of the
University of Kansas.

VII. NAVAL ENGINEERING.--Improvement in Laying Out Frames
of Vessels.--The Frame Placer.--By GUSTAVE SONNENBURG.--Ingenious
apparatus for use in ship yards.--1 illustration.

Sea-going Torpedo Boats.--The inutility of small torpedo boats
at sea.--The construction of larger ones discussed.

VIII. ORDNANCE.--Firing Trial of the 1101/2 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.

XII. TECHNOLOGY.--Furnace for Decomposing Chloride of Magnesium.--Furnace
with rotating chamber for use by alkali manufacturers.--1
illustration.

Not