Chapter IV: CHEMISTRY AND METALLURGY.--New Process for Separating Iodine

and Bromine from Kelp.--Inoffensive Colors for Toys.--New Coloring
Matters.--Tungsten.

Ozone and the Atmosphere. By ALBERT R. LEEDS, Ph.D. Table of
percentage of ozone contained in the atmosphere at various
localities in the United States. Register of ozone observations
for one month at Upper Saranac Lake, N. Y., giving thermometric
and barometric observations, and full record of weather.
Examination of methods in ozonometry. Preparation of ozone by
electrolysis of water containing sulphuric acid, with 1 engraving.
Preparation by electricity, with 1 engraving. Does the electric
spark decompose potassium iodide? Collection and preservation of
ozone. Preparation by chemical methods. Critical examination of
ozonoscopes. Potassium iodide; starch; paper classification of
ozonoscopes. Examination of ozonoscopes under certain conditions.

Limits of the Combustibility of Gases.--The Diffusion of
Salicylate of Soda.--Singular use of Fluorescein.--New Metal.
Philippium By M. MARC DELAFONTAINE.--Better Pharmaceutical
Education. By RICHARD V. MATTISON, Ph. G.--An El Dorado for
Apothecaries.