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