I. CHEMISTRY.--The Bitter Substance of Hops.--By Dr. H. BUNGENER.
--What gives hops their bitter taste?--Processes for obtaining
hop-bitter acid.--Analysis of the same.
II. ENGINEERING AND MECHANICS.--Improvements in the Harbor
of Antwerp.--With engraving of caisson for deepening the
river.
Progress of Antwerp.--Recent works in the harbor.
Bicycles and Tricycles.--By C.V. BOYS.---Advantages of the
different machines.--Manner of finding the steepness of a hill
and representing same on a map.--Experiments on ball bearings.--
The Otto bicycle.
The Canal Iron Works, London.
Marinoni's Rotary Printing Press.--With 2 engravings.
Chenot's Economic Filter Press.--With engraving.
Steel Chains without Welding.--Method and machines for making
same.--Several figures.
III. TECHNOLOGY.--Some Economic Processes connected with the
Cloth Making Industry.--By Dr. WM. RAMSAY.--How to save and
utilize soap used in wool scouring.--To recover the indigo from
the refuse.--Extraction of potash from _suint_.--Use of
bisulphide of carbon.
IV. PHYSICS. ELECTRICITY, ETC.--Thury's Dynamo Electric Machine.
--5 figures.
Breguet's Telephone.
Munro's Telephonic Experiments.--9 figures.
Apparatus for Maneuvering Bichromate of Potassa Piles from a
Distance.--2 figures.
Magnetic Rotations.--By E.L. VOICE.--1 figure.
Lighton's Immersion Illuminator.--1 figure.
Foucault's Pendulum Experiments.--By RICHARD A. PROCTOR.
--4 figures.
V. ARCHITECTURE, ART, ETC.--St. Paul's Vicarage, Forest Hill,
Kent.--2 engravings.
Designs for Iron Gates.--An engraving.
VI. ASTRONOMY.--A New Lunarian.--By Prof. C.W. MACCORD.
--With 3 figures.
VII. GEOLOGY.--Coal and its Uses.--By JAMES PYKE.--Formation
of carboniferous rocks and the coal in the same.--Processes of
nature.--Greatness of this country due to coal.--Manufacture of
gas.--Products of the same.
VIII. NATURAL HISTORY, BOTANY. ETC.--The Wine Fly.--The
egg.--Larva.--Pupa and fly.
The "Potetometer." an Instrument for Measuring the Transpiration
of Water by Plants.--1 figure.
Bolivian Cinchona Forests.
Ferns.--Nephrolepis Davillioides Furcans and Nephrolepis Duffi.
--2 engravings.
IX. PHYSIOLOGY, HYGIENE, ETC.--The Upright Attitude of Mankind.
--Review of a lecture by Dr. S.V. CLEVENGER, in which he
tries to prove that man must have originated from a four footed
being.
Our Enemies, the Microbes.--Affections caused by the same.--
Experiments of Davaine, Pasteur, and others.--How to prevent
bacterides from entering the body.--5 figures.