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.