The "Swallow," a New Vehicle.

Boring an Oil Well.

A Cement Reservoir.--2 figures.

"Flying."


II. TECHNOLOGY.--Iron and Steel.--By BARNARD SAMUELSON.
The world's production of pig iron.--Wonderful uses and demands
for iron and steel.--Progress of Bessemer steel.--Latest
improvements in iron making.--Honors and rewards to inventors.
--Growth of the Siemens-Martin process.--The future of iron and
steel.--Relations between employers and workmen.

Machine for Grinding Lithographic Inks and Colors.--1 figure.

A new Evaporating apparatus.--2 figures.

Photo Plates.--Wet and Dry.

Gelatino Bromide Emulsion with Bromide of Zinc.

The Removal of Ammonia from Crude Gas.

III. MEDICINE AND HYGIENE.--The Hair, its Uses and its Care.
The Influence of Effective Breathing in Delaying the Physical
Changes Incident to the Decline of Life, and in the Prevention