insurance of
lives, with tables and calculations

VI. MATHEMATICS.--The Trisection of Any Angle.--By FREDERIC R.
HONEY, Ph.B.--A very ingenious demonstration of this problem,
based on the properties of conjugate hyperbolas

VII. METEOROLOGY.--Note on the Mt. Blanc Meteorological Station

The Flood at Karlsbad.--Account of the recent flood and of its
destructive effects.--1 illustration

VIII. MECHANICAL ENGINEERING.--Station for Testing Agricultural
Machines.--A proposed establishment for applying dynamometer
tests to agricultural machines.--1 illustration

Steam Engine Valves.--By THOMAS HAWLEY.--A review of modern
slide valve practice, the lap, cut-off, and other points.--6
illustrations

IX. MISCELLANEOUS.--Science in the Theater.--Curious examples of
stage effect in fictitious mesmerizing and hypnotizing.--4
illustrations

Theatrical Water Plays.--Recent episodes in real water plays at
Hengler's Circus, London.--2 illustrations

X. NAVAL ENGINEERING.--The French Ironclad War Ship Colbert.--An
armored wood and iron ship, with central battery.--1
illustration

XI. PHYSIOLOGY AND HYGIENE.--Newer Physiology and Pathology.--By
Prof. SAMUEL BELL. M.D.--An excellent presentation of modern
practice in the light of bacteriology

Test Card Hints.--How to test the eyes for selecting eyeglasses
and spectacles

The Composition of Koch's Lymph.--What Prof. Koch says it is and
what it can do.--The cabled account of the disclosure so long
waited for

XII. TECHNOLOGY.--Firing Points of Various Explosives.--The
leading explosives, with the temperature of their exploding
points tabulated

The Recovery of Gold and Silver from Plating and Gilding
Solutions--A paper of interest to silver and gold platers, as
well as photographers

Water Softening and Purifying Apparatus.--An apparatus for
treatment of sewage, etc., chemically and by deposition.--1
illustration

* * * * *

THE FRENCH IRONCLAD WAR SHIP COLBERT.

The central battery ironclad Colbert is one of the ten ships of the
French navy that constitute the group ranking next in importance to
the squadron of great turret ships, of which the Formidable is the
largest. The group consists of six types, as follows:

1. The Ocean t