ation of Fusel Oil 5816

On Silicon.--Curious formation of silicide of platinum 5816

Stannous Nitrates.--The formation of explosive
compounds in machines by the corrosion of bronze and
tin solder 5816

Metallic Thorium. By L.F. Nilson 5816

Friedrich Woehler.--Obituary notice of the great German
chemist 5816

Apparatus for Printing by the Blue Process. By
Channing Whitaker.--3 figures 5820

III. ELECTRICITY, LIGHT, HEAT, ETC.--Spectrum Gratings 5822

A New Pocket Opera Glass.--4 figures 5822

Atoms, Molecules, and Ether Waves. By JOHN TYNDALL.
Action of heat and light on molecules.--Heat as an
agent in exploring molecular conditions.--The results
of a recent incursion into the extra-sensible world
of atoms and molecules 5823

Apparatus for Measuring Electricity at the Upper
School of Telegraphy. By E. MERCADIER.--5 figures.
Constant vibrator.--The Electrical tuning fork.
Arrangement for testing electric piles.--Very rapid
electric tuning fork.--A vibrating micrometer 5824

IV. NATURAL HISTORY.--Our Origin as a Species. By RICHARD
OWEN.--The Neanderthal skull.--Differential characters
between the lowest _Homo_ and the highest _Simia_ 5825

The Aba or Odika. By Dr. W.H. BACHELER.--A remarkable
tree of West Africa 5826

California Cedars 5826

* * * * *

APPARATUS FOR MANUFACTURING GASEOUS OR AERATED BEVERAGES.

The apparatus employed at present for making gaseous beverages are
divided into two classes--intermittent apparatus based on chemical
compression, and continuous ones based on mechanical compression.

The first are simple in appearance and occupy small space, but their use
is attended with too great inconveniences and losses to allow them to be
employed in cases where the manufacture is of any extent, so the
continuous apparatus are more and more preferred by those engaged in the
industry.

Continuous apparatus, however, other than those that we now propose to
occupy ourselves w