illustration

II. BIOLOGY.--Can we Separate Animals from Plants?--By ANDREW
WILSON.--A debated point well discussed.--The bases on which
distinctions must be drawn

III. ELECTRICITY.--A New Electric Ballistic Target.--A target
for investigations of the velocity of projectiles, now in use at
the United States Military Academy, West Point, N.Y.--1
illustration.

Electric Erygmascope.--An electric lighting apparatus for
examining earth strata in bore holes for geologists' and
prospectors' use.--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