is required for the selection of the
right kind for each particular purpose, and how by processes of
mixture or manufacture the requisite qualities are obtained in each
case."--_Manchester Guardian._

* * * * *

=AMMONIA AND ITS COMPOUNDS:= Their Manufacture and Uses. By CAMILLE
VINCENT, Professor at the Central School of Arts and Manufactures,
Paris. Translated from the French by M. J. SALTER. Royal 8vo. 113 pp.
1901. Thirty-two Illustrations. Price 5s.; India and Colonies, 5s. 6d.;
Other Countries, 6s.; strictly net.

=Contents.=

Chapters I., =General Considerations=: Sections 1. Various Sources of
Ammoniacal Products; 2. Human Urine as a Source of Ammonia. II.,
=Extraction of Ammoniacal Products from Sewage=: Sections 1.
Preliminary Treatment of Excreta in the Settling Tanks--The Lencauchez
Process, The Bilange Process, The Kuentz Process; 2. Treatment of the
Clarified Liquors for the Manufacture of Ammonium Sulphate--The Figuera
Process and Apparatus, Apparatus of Margueritte and Sourdeval, The Lair
Apparatus, Apparatus of Sintier and Muhe, Apparatus of Bilange, The
Kuentz Process, Process and Apparatus of Hennebutte and De Vaureal; 3.
Treatment of Entire Sewage--Chevalet's Apparatus, Paul Mallet's
Apparatus, Lencauchez's Apparatus. III., =Extraction of Ammonia from Gas
Liquor=: Sections 1. Clarification of Gas Liquor; 2. Manufacture of
Ammonium Sulphate--A. Mallet's Apparatus, A. Mallet's Modified
Apparatus, Paul Mallet's Apparatus, Chevalet's Apparatus, Grueneberg's
Apparatus; 3. Concentration of Gas Liquor--Solvay's Apparatus, Kuentz's
Apparatus, Grueneberg's Apparatus. IV., Manufacture of Ammoniacal
Compounds from Bones, Nitrogenous Waste, Beetroot Wash and Peat=:
Sections 1. Ammonia from Bones: 2. Ammonia from Nitrogenous Waste
Materials; 3. Ammonia from Beetroot Wash (Vinasse): 4. Ammonia from
Peat--Treatment of the Ammoniacal Liquors. V., =Manufacture of Caustic
Ammonia, and Ammonium Chloride, Phosphate and Carbonate=: Sections 1.
Manufacture of Caustic Ammonia; 2. Manufacture of Ammonium
Chloride--From Fermented Urine, Process of the Lesage Company, Kuentz's
Process; From Gas Liquor, English Process, Kuentz's Process; From the
Dry Distillation of Animal Matter; From Ammonium Sulphate, Sublimation;
3. Ammonium Phosphates; 4. Carbonates of Ammonium--Sesquicarbonate from
Animal Matter, English Process. Uses. VI., =Recovery of Ammonia from the
Ammonia-Soda Mot