The Hydrodynamic Researches of Prof. Bjerknes.--By C.
W. COOKE.--5 figures. 7791

Electrotyping.--With a full description of the process. 7793

A New Seismograph.--With engraving. 7793

IV. ART AND ARCHITECTURE.--The Cathedral of the Incarnation
at Garden City. 7787

Movable Market Buildings.--7 figures and engraving of
movable flower market at Paris. 7788

Dinocrates' Project.--With three engravings of landscapes
showing human profiles. 7789

The Babylonian Palace. 7798

V. HORTICULTURE.--The Stone Pine (Pinus Pinea).--With
engraving. 7797

VI. HYGIENE, ETC.--The Otoscope.--With engraving. 7794

State Provision for the Insane.--By C. M.
HUGHES, M.D. 7794

VII. MISCELLANEOUS.--The Xylophone.--2 engravings. 7793

The Courage of Originality. 7795

A Circular Bowling Alley.--With engraving. 7795

Patent Office Examination of Inventions. 7795

The Universal Exposition at Antwerp, Belgium.--With full
page engraving. 7797

The Art of Breeding. 7798

* * * * *

ACKNOWLEDGMENTS.

We give in this number of our SUPPLEMENT several articles with
illustrations, for which we are indebted to _La Nature_. They are
entitled Electric Light Apparatus for Military Purposes, The Otoscope,
A New Seismograph, Dinocrates' Project, The Xylophone, Plan of an
Elevated Railway for Paris.

* * * * *

A VISIT TO THE CREUSOT WORKS.

Here we are at the great forge (Fig. 1), that wonderful creation which
has not its like in France, that gigantic construction which iron has
wholly paid for, and which covers a space of twenty-four acres. We
first remark two puddling halls, each of which contains 50 furnaces
and 9 steam hammers. It is in these furnaces that the iron is puddled.
The ball or bloom thus obtained is afterward taken to the hammer,
which crushes it and expels the scoriae.

[Illustration: FIG. 1.--THE GREAT HAL