spinning.

New Binding Machines. 3 figures.

Flumes and their construction. 1 figure.

Chuwab's Rolling Mill for Dressing and Rounding Bar Iron.
9 figures.

Burning of Town Refuse at Leeds. 6 figures.--Sections and
elevations of destructor and carbonizer.

II. TECHNOLOGY AND CHEMISTRY.--Friedrich Wohler.--His
labors and discoveries.

New Gas Burner. 3 figures.--Grimstone's improved gas burner.

Defty's Improvements in Gas Burners and Heaters. 4 figures.

The Collotype in Practice.

Determination of Potassa in Manures.--By M. E. DREYFUS.

III. HYGIENE, MEDICINE, ETC.--The Air in Relation to Health.
By Prof. C. F. CHANDLER.

The Plantain as a Styptic.

Bacteria.