Lime: Knibbs, 39.

Aeronautics: Aircraft year book, 35.

Alcohol: McIntosh, 41.

Alloys: Bonnin, 36.

Ammonia: Parrish, 41.

Astronomy: History, 38.

Atoms: Berthoud, 35; Lodge, 40.

Automobiles: Blanchard, 35; Judge, 39;
Lomer, 40; Moreton, 41.

Biography: Geikie, 37; Killeffer, 39.
Boats: Hacker, 38.

Bridges: Ketchum, 39.

Building: Brinckloe, 36; Crussel, 37;
Ketchum, 39; Soman, 42.

Carpentry: Crussel, 37.

Cellulose: Heuser, 38.

Chemistry: Chemistry, 36; Craig, 36; Ga-
rard, 37; Hepworth, 38; Hopkins, 38;
Killeffer, 39; Kingsett, 39; Lunge, 41;
Partington, 41; Thomas, 43.

China Wood Oil: Stevens, 42.

Civil Engineering: Barber, 35.

Colloids: Bogue, 35; Kopaczewski, 40.

Complex Salts: Thomas, 43.

Concrete: Hool, 38.

Converters: Ibbetson, 39.

Corrosion: Calcott, 36.

Cotton: Harding, 38.

Crystals: Tutton, 43.

Dictionaries: Schlomann, 42.

Distillation: Rechenberg, 42.

Electricity: Harvey, 38; Kemp, 39; Wade,
43.

Electro-Deposition: Langbein, 40.
Engineering in War: Clarkson, 36.
Estimating: Barnes, 35.

Fire Protection: Crosby, 37.
Geology: Geikie, 37.

Hydraulics: Sprague, 42.

Inventions: Gibson, 37.

Machine Tools: Jones, 39.

Magnesia: Knibbs, 39.

Mathematics: Lovitt, 40; Palmer, 41.
Matter: Berthoud, 35; Cranston, 36.
Microscope: Beck, 35.

Mountaineering: Associated Mountaineer-
ing Clubs of North America, 35.
Painting: E. I. Dupont de Nemours & Co.,
37.

Paper: Joint executive..., 39; Leicester, 40.
Photography: Wall, 43.

Physics: Boscovich, 36; Jeans, 39; Smith,
42.

Pumps: Swindin, 43.
Rafia: Lawson, 40.

Railways: Library, 40.

Rectifiers: de Bruyne, 36.

Refrigeration: Williams, 43.

Relativity: Jeffery, 39.

Roads: Leeming, 40.

Science: Downing, 37.

Selenium: Fournier d'Albe, 37.

Sewage Disposal: General Filtration Co., 37.

Spectroscopy: Baly, 35.

Statistics: Forsyth, 37.

Steam Boilers: American Society of Me-
chanical Engineers, 35.

Steam Engineering: Regnauld, 42.
Sulphuric Acid: Parkes, 41; Wyld, 43.
Surveying: Whitelaw, 43.

Telephones: Ellson, 37; Harrison, 38.
Textiles: Dumville, 37; Pearson, 42.
Timber Preservation: National, 41.
Waterproofing: Pearson, 42.

Welding: Holslag, 38.

Wiring: Croft, 36; Willoughby, 43.

Woodworking Machinery: Noyes, 41; Ran-
some, 42.