Useful Bags and How to Make Them.--Interesting paper on the trunk makers' art.--4 illustrations. 8960 VIII. NAVAL ENGINEERING.--Atlantic Steamers.--By W. JOHN.-- Exhaustive comparison of representative Atlantic liners and war ships.--3 illustrations. 8954 Jet Propellers.--Hydraulic propulsion of vessels.-- Mathematical examination of this subject. 8951 IX. ORDNANCE.--The New Army Gun.--Description of the 8-inch steel gun as manufactured at the West Point, N.Y., Foundry.--1 illustration. 8952 X. PHYSICS.--A New Thermo Regulator.--1 illustration. 8959 Cohesion and Cohesion Figures.--By WILLIAM ACKROYD, F.I.C.--Laws of vortex rings examined, and relation of solubility to cohesion. 8963 Pipette for taking the Density of Liquids.--Apparatus and calculations for use.--1 illustration. 8959 XI. TECHNOLOGY.--Impurities in Photographic Chemicals, and Tests for Same.--Table referred to in a paper read before the Birmingham Photographic Society by G.M. Jones, M.P.S. 8957 Molasses, how made.--Work on Plantations Graphically Described.* 8961 Optical errors and human mistakes.--By ERNST GUNDLACH.--On the examination of optical glasses.--A paper read before the Buffalo meeting of the A.A.A.S. 8963 Soap.--By HENRY LEFFMANN, Ph.D. 8962 Somzee's New Gas Burners.--Interesting description of regenerative burners.--9 figures. 8958 The Clamond Gas Burner.--Of value as a supplement to the above named article, describing an incandescent burner. --1 illustration. 8959 Wood Oil.--A new industry worked on the large scale in Sweden. 8962 * Transcriber's Note: "Work on Plantations..." was originally part of TOC entry "Optical Errors..." * * * * * COMPOUND HYDRAULIC PRESSES.