| TABLE OF CONTENTS. |
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| I. | BOTANY.—The Relation of Tabasheer to MineralSubstances.—The composition of this curious secretion of thebamboo.—Analyses and properties of the material, according tovarious observers.—Its appearance under the microscope. 1illustration. |
| II. | CHEMISTRY.—Apparatus for DryingFlour.—An apparatus for determining the moisture in flour. 1illustration. |
| III. | ELECTRICITY.—Automatic Commutator forIncandescent Lamps.—An apparatus for lighting automatically anew lamp to replace one that has failed. 1 illustration. |
| Definitions and Designations inElectro-Technics.—Mr. Jamieson's proposed code of electricsymbols—literal and graphic. 4 illustrations. |
| IV. | ENGINEERING.—New DredgingMachinery.—The dredger Ajax, recently built inCalifornia.—Its dimensions and capacity. 1 illustration. |
| Reservoir Dams.—By DAVID GRAVELL.—Theengineering details of dams.—Typical masonry and earthworkdams of the world. 23 illustrations. |
| The Flexible Girder Tramway.—A new type ofsuspended railway—a modification of the wire tramway system.21 illustrations. |
| V. | HYGIENE.—Climate in its Relation toHealth.—By G.V. POORE, M.D.—The third lecture of thisseries.—Consideration of the floating matter of the air anddiseases caused thereby.—Causation of hay fever. |
| VI. | MATHEMATICS.—Radii of CurvatureGeometrically Determined.—By Prof. C.W. MACCORD,Sc.D.—No. VII. Path of a point on a connecting rod. 3illustrations. |
| VII. | MICROSCOPY.—Improved Microscopical SettlingTube.—By F. VANDERPOEL.—New tubes for use in urinaryanalysis. 4 illustrations. |
| VIII. | MISCELLANEOUS.—Apparatus for ManufacturingBouquets.—An ingenious machine for facilitating theconstruction of bouquets. 1 illustration. |
| Bozerian's Refrigerant Punkas.—A fan workedby the feet, a substitute for the Indian punka. 2illustrations. |
| How to Make a Kite without a Tail.—Animproved form of kite described and illustrated. 1illustration. |
| Punkas.—By J. WALLACE, C.E.—Themechanics of punkas; experiments on their rate of swing. |
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