ry based on dynamic electricity.--Full details. 13132

The Two or Three Phase Alternating Current Systems.--By
CARL HERING.--A new industrial development in electricity
fully described and graphically developed.--15
illustrations. 13130

V. GEOGRAPHY AND EXPLORATION.--The Grand Falls of
Labrador.--The Bowdoin College exploring expedition and
its adventures and discoveries in Labrador. 13140

VI. MECHANICAL ENGINEERING.--Improved Changeable Speed
Gearing.--An ingenious method of obtaining different speeds
at will from a single driving shaft.--2 illustrations. 13129

Progress in Engineering.--Notes on the progress of the last
decade. 13129

VII. MEDICINE AND HYGIENE.--Eyesight.--Its Care during Infancy
and Youth.--By L. WEBSTER FOX, M.D.--A very timely
article on the preservation of sight and its deterioration
among civilized people. 13135

The Use of Compressed Air in Conjunction with Medicinal
Solutions in the Treatment of Nervous and Mental
Affections.--By J. LEONARD CORNING.--The enhancement of
the effects of remedies by subsequent application of
compressed air. 13134

VIII. MINERALOGY.--A Gem-Bearing Granite Vein in Western
Connecticut.--By L.P. GRATACAP.--A most interesting
mineral fissure yielding mica and gems recently opened. 13141

IX. NATURAL HISTORY.--Ants.--By RUTH WARD KAHN.--An
interesting presentation of the economy of ants. 13140

X. NAVAL ENGINEERING.--Armor Plating on Battleships--France
and Great Britain.--A comparison of the protective systems
of the French and English navies.--5 illustrations. 13127

The Redoutable.--An important member of the French
Mediterranean fleet described and illustrated.--1
illustration. 13127

XI. TECHNOLOGY.--New Bleaching Apparatus.--A newly invented
apparatus for bleaching pulp.--2 illustrations. 13133

* * * * *

THE REDOUTABLE.

The central battery and barbette ship Redoutable, illustrated this
week, forms part of the French Mediterranean squadron, and