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
      of hay fever.

VI.  Mathematics.—­Radii of Curvature Geometrically Determined.—­By
      Prof.  C.W.  MACCORD, Sc.D.—­No.  VII.  Path of a
      point on a connecting rod. 3 illustrations.

VII.  Microscopy.—­Improved Microscopical Settling Tube.—­By F.
      Vanderpoel.—­New tubes for use in urinary analysis. 4
      illustrations.

VIII.  Miscellaneous.—­Apparatus for Manufacturing Bouquets.—­An
      ingenious machine for facilitating the construction of
      bouquets. 1 illustration.

      Bozerian’s Refrigerant Punkas.—­A fan worked by the feet, a
      substitute for the Indian punka. 2 illustrations.

      How to Make a Kite without a Tail.—­An improved form of kite
      described and illustrated. 1 illustration.

      Punkas.—­By J. Wallace, C.E.—­The mechanics of punkas;
      experiments on their rate of swing.

      The Edible Earth of Java.—­An account of this curious substance,
      its taste and appearance.

IX.  Naval engineering.—­Another Remarkable Torpedo Boat.—­Over
      twenty-eight miles an hour.—­Full particulars of the trial of
      one of the new Italian torpedo boats, built by Yarrow & Co.

      Copeman & Pinhey’s Life Rafts.—­A new life raft for use on
      steamers, folding into deck settees. 3 illustrations.

X. Physics.—­Sunlight Colors—­By Capt.  W. De W. Abney.—­A valuable
      lecture on the cause of the colors of the sun, and their relative
      intensities. 3 illustrations.