2
ruction of underground aqueducts.
Steam Engine Economy.--By Chief Engineer J. LOWE, U.S.N.--With diagram.
The "Elastic Limit" in Metals.--Selection of wire for suspension bridges, etc.
Prices of Metals in 1874 and 1884.--With table.
II. TECHNOLOGY.--A Method of Measuring the Absolute Sensitiveness of Photographic Dry Plates.--By Wm. H. PICKERING.--From the proceedings of the Academy of Arts and Sciences.
Soldering and Repairing Platinum Vessels in the Laboratory.--By J.W. PRATT.
The Helicoidal or Wire Stone Saw invented by M.P. GAY.--With engraving of quarry showing application of saw, and 5 figures.
Portable Prospecting Drill and Automatic Safety Gear shown at the Inventions Exhibition.--With 2 engravings.
III. ELECTRICITY, ETC.--Electricity in Warfare.--By Lieutenant B.A. FISKE, U.S.N.--Electrical torpedoes.--Torpedo detecter.--Military telegraphy and telephony.--Electricity for firing great guns.--Arrangement of wires for lights.--The search light.--Incandescent lamps for sight signaling.--Electrical launches.--An "electric sight".
Meucci's Claims to the Telephone.--With description of his instrument and 10 figures.
An Electric Centrifugal Machine for Laboratories.--By ALEX. WATT.--From paper read before the British Association.--1 figure.
Transmission of Power by Electricity.--Experiments of M. MARCEL DEPREZ.
IV. ART AND ARCHITECTURE.--Quadriga for the New House of Parliament at Vienna.--An engraving.
Glazed Ware Finial.--With engraving.
Hotel de Ville, St. Quentin.--With engraving.
Fire Doors in Mills.--From a lecture before the Franklin Institute by C.J. HEXAMER.
V. NATURAL HISTORY, ETC.--Preservation of Insects.
An Accomplished Parrot.
The Roscoff Zoological Laboratory.--The buildings and rooms.--The aquarium.--Course of study.
The Murænæ at the Berlin Aquarium.--With engraving.
Metamorphosis of Arctic Insects.
VI. MEDICINE. ETC.--A Year's Scientific