--Review of the work by Prof. EDWARD C. PICKERING.

II. BIOLOGY.--Sponges.--The growth and life history of sponges.--Report
of a recent lecture at the London Royal Institution by Dr.
R. VON LEDENFELD.

III. ELECTRICITY.--Phenomena of Alternating Currents.--By Prof.
ELIHU THOMSON.--16 illustrations.

IV. ENGINEERING.--An English Car Coupling.--Description of an
English automatic coupling.--2 illustrations.

A New Process of Casting Iron and other Metals upon Lace,
Embroideries, Fern Leaves, and other Combustible Materials.
--By A.E. OUTERBRIDGE, JR.--A new and eminently practical
process of producing ornamental castings.--4 illustrations.

Bricks and Brick Work.--By Prof. T. ROGER SMITH, F.R.I.B.A.
--The history and technical review of this subject.--A most
remarkable contribution to the engineering of architecture.

Link Belting.--By CHARLES A. SCHIEREN.--An interesting and
practical paper on leather belting made of links.
--9 illustrations.

Recent Progress in Gas Engineering.--A lecture by Mr. A.
MACPHERSON, of Kirkcaldy, reviewing the last improvements
in this branch.

V. MISCELLANEOUS.--Herbet's Tepid Douche.--Apparatus in use