guns.--Steel castings.--Breech loading.--Long guns.--Slow
burning of powder.--Breech closers.--Projectiles.--Destructive
power of guns.

Oscillating Cylinder Locomotive. 2 figures.--Shaw's oscillating
cylinder locomotive.

Gas Motors and Producers. By C. W. SIEMENS--2 figures.

The Bazin System of Dredging. By A. A. LANGLEY.--3 figures.

II. CHEMISTRY.--On the Mydriatic Alkaloids. By ALBERT LADENBERG.
--I. Atropine.--II. The Atropine of Datura Stramonium.
--III. Hyoscyamine from Hyoscyamus.

Detection of Small Quantities of Morphia. By A. JORISSEN.

The Estimation of Manganese by Titration. By C. G. SARNSTROM.

On the Estimation and Separation of Manganese. By NELSON
H. DARTON.

Delicate Test for Oxygen.

Determination of Small Quantities of Arsenic in Sulphur. By H.
SCHAEPPI.

III. BIOLOGY, ETC.--Researches on Animals Containing Chlorophyl.
--Abstract of a long and valuable paper "On the Nature and Functions
of the Yellow Cells of Radiolarians and Coelenterates," read