--1 illustration
The Electro-Magnet.--By Prof. SILVANUS THOMPSON.--Continuation
of this exhaustive treatise, giving further details on special
points of construction.--1 illustrations
IV. ENTOMOLOGY.--Potash Salts.--The use of potash salts as
insecticides, with accounts of experiments
The Outlook for Applied Entomology.--By Dr. C.V. RILEY, U.S.
entomologist.--The conclusion of Prof. Riley's lecture, treating
of the branch of entomology with which his name is so honorably
associated
V. INSURANCE.--The Expense Margin in Life Insurance.--Elaborate
review of the necessary expenses of conducting the 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.
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