bstances are known to be contained in the
rocks of the earth's crust, which also has at various times afforded
the necessary heat.

GOLD, though the principal standard of value, is not moved about the
world much. The entire import of London, the greatest banking city in
the world, was only $116,222,350 in 1876, and the export was
$81,097,850. Nearly the whole of the difference went into the vaults of
the Bank of England, the stock of which increased $34,992,020.

PROF. HAWES has proved the existence of metallic iron in the basalt
dykes of New Hampshire. It exists as small specks in the centre of
grains of magnetite. This contradicts the theory that the metallic iron
of the dykes is the result of carbon acting upon the magnetite in them,
and proves that the iron is the primary and the magnetite the secondary
product.

THOUGH agricultural professorships are not considered to have produced
all the good that was once expected from them, there is one lately
established by the French Government which might well be copied in
other countries. It is a professorship of comparative agriculture at
Vincennes, and its occupant will make a systematic comparison of home
and foreign agriculture.

THE character of the Yale lectures to mechanics is seen from the
following titles to some of the lectures: "Forester and Forest
Products," Prof. William H. Brewer; "Mosses," Prof. C. D. Eaton; "Our
Red Sandstone," G. W. Hawes; "The Usury Laws," Prof. F. A. Walker; and
"Sanitary Engineering," Prof. W. P. Trowbridge. The course contains
thirteen lectures, and costs $1.

A FRENCH paper says that "an American company proposes to introduce fur
seals from Alaska into Lake Superior! The temperature of the lake is
considered to be sufficiently cold for the purpose, and the company
hopes to obtain from Congress and the Canadian Parliament an act
protecting the creatures from slaughter for twenty years, after which
time it is supposed that they will be sufficiently acclimatized and
numerous to form subjects of sport." As the fur seal is a marine animal
and Lake Superior is a body of fresh water, the success of the
experiment, and even the authenticity of the story, is at least
doubtful!

M. GIFFARD, inventor of the steam injector which bears his name, has
entered upon a line of invention of which Americans have been very
fond. He is building a small steamer to ply, during the French
Exposition, over the three miles of the Seine betwee