II. CHEMISTRY.--Apparatus for Drying Flour.--An apparatus for
determining the moisture in flour. 1 illustration.


III. ELECTRICITY.--Automatic Commutator for Incandescent
Lamps.--An apparatus for lighting automatically a new lamp to
replace one that has failed. 1 illustration.

Definitions and Designations in Electro-Technics.--Mr. Jamieson's
proposed code of electric symbols--literal and graphic. 4
illustrations.


IV. ENGINEERING.--New Dredging Machinery.--The dredger Ajax,
recently built in California.--Its dimensions and capacity. 1
illustration.

Reservoir Dams.--By DAVID GRAVELL.--The engineering details
of dams.--Typical masonry and earthwork dams of the world. 23
illustrations.

The Flexible Girder Tramway.--A new type of suspended railway--a
modification of the wire tramway system. 21 illustrations.


V. HYGIENE.--Climate in its Relation to Health.--By G.V. POORE,
M.D.--The third lecture of this series.--Consideration of the
floating matter of the air and diseases caused thereby.--Causation