ARNDT-KATZ—A Popular Treatise on the Colloids in the Industrial Arts. Translated from the Second Enlarged Edition. 12mo. Pages VI + 73.

ARNOLD—The Motor and the Dynamo. 8vo. Pages VI + 178. 166 Figures.

BENEDICT—Elementary Organic Analysis. Small 8vo. Pages VI + 82. 15 Illustrations.

BERGEY—Handbook of Practical Hygiene. Small 8vo. Pages 164.

BILTZ—Practical Methods for Determining Molecular Weights. (Translated by Jones). Small 8vo. Pages VIII + 245. 44 Illustrations.

BOLTON—History of the Thermometer. 12mo. Pages 96. 6 Illustrations.

BRYDEN AND DICKEY—A Text Book of Filtration. 8vo. Pages XII + 376. 264 Illustrations.

BURGESS—Soil Bacteriology Laboratory Manual. 12mo. Pages VIII + 123. 3 Illustrations.

CAMERON—The Soil Solution, or the Nutrient Medium for Plant Growth. 8vo. Pages VI + 136. 3 Illustrations.

CLINTON—Further Light on the Theory of the Conductivity of Solutions. Pages 15. Paper Cover.