unicipal Society. New York city: Published by
Order of the Society, 87 Madison avenue.

A review of the whole subject of our water supply, its sources
and the area they drain, the geographical features of the
district, and the works erected by the city. Mr. Butler
maintains that the Croton valley, with proper storage
reservoirs, can abundantly supply the whole city; and that no
new aqueduct need be constructed in the present condition of the
public debt.

EINE KURZE ALLGEMEINE EINLEITUNG ZU DEN AROMATISCHEN
NITROVERBINDUNGEN. Von Peter Townsend Austen. Leipzig, Germany:
Winter, Publisher.

We are glad to see that an American is able to publish a very
useful chemical treatise in Germany, the great head center of
chemistry. Dr. Austen, one of our most distinguished young
chemists in the field of original research, has produced a work
which bears the marks of much patient thought and study. The
book is dedicated to the renowned German chemist, Professor A.W.
Hofmann.

OUR YOUNG FOLKS' MAGAZINE: a Monthly Journal of Instruction and
Amusement. Subscription price, $1.60 a year. Boston, Mass.: Post
Office Box 3090.

A readable little periodical, well calculated to amuse the
little ones for whom it is intended.

GLASS FOR THE STUDIO AND DARK ROOM. By Thomas Gaffield. Philadelphia,
Pa.: Benerman & Wilson.

There is much useful information in this little pamphlet, and
photographers especially should read it. The matter first
appeared in the Philadelphia _Photographer_.

* * * * *

RECENT AMERICAN AND FOREIGN PATENTS

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NEW AGRICULTURAL INVENTIONS.

IMPROVED GANG PLOW.

Ezra Peak, Montana, Kan.--This invention is so constructed that it may
be easily raised from and lowered to the ground, and adjusted to work
at any desired depth in the ground. It is claimed to be of lighter
draft than plows constructed in the usual way, also to be simple in
construction and inexpensive in manufacture. The wheels, the faces of
which are notched to give them a slight up-and-down movement as they
are drawn forward, slightly jar the plows, and thus cause them to be
easier drawn than when smooth wheels are used. The shaft can be
provided with a ratchet wheel and pawl to hold it in any position into
which it may be turned; and to it is attached a rope or chain, the