I. BOTANY.—­New Race of Dwarf Dahlias.—­A new and valuable flowering plant, with portrait of the introducer.—­1 illustration.

II.  Chemistry.—­Carbon in Organic Substances.—­By J. Messinger.—­
      An improved method of determining carbon by inorganic
      combustions.—­1 illustration.

III.  Civil engineering.—­A New Integrator.—­By Prof.  Karl
      Pearson.  M.A.—­An apparatus for use for the engineer in working
      up areas, indicator diagrams, etc.—­4 illustrations.

      Best Diameter of Car Wheels.—­The size of car wheels from the
      standpoint of American engineering.—­A plea for a moderate sized
      wheel.

      Improved Overhead Steam Traveling Crane.—­A crane constructed
      for use in steel works.—­Great power and range.—­3 illustrations.

      Some Hints on Spiking Track.—­A most practical article for telling
      exactly how to conduct the operation on the ground.—­1 illustration.

IV.  Electricity.—­Electrical Laboratory for Amateurs.—­By GEO.
      M. Hopkins.—­A simple collection of apparatus for conducting a
      complete series of electrical experiments.—­17 illustrations.

      The Action of the Silent Discharge on Chlorine.—­How an electric
      discharge affects chlorine gas.—­An important negative result.

V. Ethnology.—­Some Winnebago Arts.—­An interesting article
      upon the arts of the Winnebago Indians.—­A recent paper before
      the New York Academy of Sciences.

VI.  Medicine and Hygiene.—­The Philosophy of Consumption. 
      —­By Dr. J.S.  Christison.—­A review of the present theories of
      consumption, and the role played in it by its bacillus.

VII.  Music.—­Spacing the Frets on a Banjo Neck.—­By Prof.  C.W. 
      MACCORD.—­A most practical treatment of this subject, with full
      explanations.—­1 illustration.

VIII.  Ordnance.—­High Explosives in Warfare.—­By Commander
      F.M.  Barber, U.S.N.—­An elaborate review of modern explosives
      in their applicability to ordnance, etc.

      The Experiments at the Annapolis Proving Grounds.—­The recent
      tests at Annapolis described and illustrated.—­Views of the
      projectiles, plates, etc.—­3 illustrations.

IX.  Physics.—­Araeo-Picnometer.—­An entirely novel form of hydrometer,
      of very extended use and application.—­1 illustration.

X. Technology.—­Fabric for Upholstery Purposes.—­Full technical
      description of the method of producing a new and characteristic
      fabric.—­1 illustration.

      Gaseous Illuminants.—­By Prof.  Vivian B. Lewes.—­Continuation
      of this important article, treating of the water gas and special
      processes, with analyses.