ear.--A new method devised
by Lewis Carroll.

VII. NAVAL ENGINEERING.--Some Recent High Speed Twin
Screws.--By E.A. LINNINGTON.--An important paper on the subject
of screw propulsion.--6 illustrations.

The Havre Maritime Exhibition.--Notes on the recently opened
exhibition of ships and naval appliances at Havre.--1 illustration.

The New German Corvette Greif.--A recent addition to the German
fleet illustrated and described.--1 illustration.

The Steamship Great Eastern.--A plea for the mammoth
steamer.--Probabilities of her future usefulness.

Twin Screw Torpedo Boat.--The new sea-going vessel built by
Yarrow & Co. for the Italian government.--Her extraordinary
speed.

VIII. ORDNANCE.--Our Coast Defenses.--An interesting summary
by Gen. H.L. ABBOTT of our means for defending our coasts.

The New Krupp Guns.--The dimensions of the largest guns in
the world, now in process of construction at Essen.--2 illustrations.

IX. PHYSICS.--Colors of Thin Plates.--Report of a recent lecture by
Lord Rayleigh.

X. TECHNOLOGY.--Recent Advances in Sewing Machines.--By
JOHN W. URQUHART.--A recent lecture before the Society of
Arts of London, giving an exhaustive review of the subject.--15
illustrations.

* * * * *

THE HAVRE MARITIME EXHIBITION.

The Havre Maritime Exhibition opened on the 7th of May.

Will this exhibition awaken general interest, or will it prove a local
affair simply? This is a secret of the weeks that are to follow.

Should nothing chance to discourage the general interest that surrounds
Havre, to dampen the enthusiasm of the public, or to act to the prejudice
of the exhibitors, whose very evident desire is to show nothing but
remarkable products in every line, the International Maritime Exhibition
will prove a great success.

[Illustration: THE INTERNATIONAL MARINE EXHIBITION AT HAVRE.--THE
PRINCIPAL ENTRANCE.]

The people of Havre have two points of comparison that more particularly
concern themselves: Their Maritime Exhibition of 1868, which, as far as
exhibition goes, was a complete success, is the first. The financial
results of it were not brilliant, but that was due to certain reasons upon
which it is not necessary to dwell. On the contrary, the Rouen Exhibition
of 1884 proved profitable.

The Havre Exhibition, under able