=BONE PRODUCTS AND MANURES=: An Account of the most recent Improvements in the Manufacture of Fat, Glue, Animal Charcoal, Size, Gelatine and Manures. By THOMAS LAMBERT, Technical and Consulting Chemist. Illustrated by Twenty-one Plans and Diagrams. 162 pp. Demy 8vo. 1901. Price 7s. 6d.; India and Colonies, 8s.; Other Countries, 8s. 6d.; strictly net. Contents. Chemical Composition of Bones--Arrangement of Factory--Crushing of Bones--Treatment with Benzene--Benzene in Crude Fat--Analyses of Clarified Fats--Mechanical Cleansing of Bones--Animal Charcoal--Tar and Ammoniacal Liquor, Char and Gases, from good quality Bones--Method of Retorting the Bones--Analyses of Chars--"Spent" Chars--Cooling of Tar and Ammoniacal Vapours--Value of Nitrogen for Cyanide of Potash--Bone Oil--Marrow Bones--Composition of Marrow Fat--Premier Juice--Buttons-- Properties of Glue--Glutin and Chondrin--Skin Glue--Liming of Skins-- Washing--Boiling of Skins--Clarification of Glue Liquors--Acid Steeping of Bones--Water System of Boiling Bones--Steam Method of Treating Bones--Nitrogen in the Treated Bones--Glue-Boiling and Clarifying-House --Plan showing Arrangement of Clarifying Vats--Plan showing Position of Evaporators--Description of Evaporators--Sulphurous Acid Generator-- Clarification of Liquors--Section of Drying-House--Specification of a Glue--Size--Uses and Preparation and Composition of Size--Concentrated Size--Properties of Gelatine--Preparation of Skin Gelatine--Washing-- Bleaching--Boiling--Clarification--Evaporation--Drying--Bone Gelatine --Selecting Bones--Crushing--Dissolving--Bleaching--Boiling--Properties of Glutin and Chondrin--Testing of Glues and Gelatines--The Uses of Glue, Gelatine and Size in Various Trades--Soluble and Liquid Glues--Steam and Waterproof Glues--=Manures=--Importation of Food Stuffs--Soils--Germination--Plant Life--=Natural Manures=--Water and Nitrogen in Farmyard Manure--Full Analysis of Farmyard Manure--Action on Crops--Water-Closet System--Sewage Manure--Green Manures--=Artificial Manures=--=Mineral Manures=--Nitrogenous Matters--Shoddy--Hoofs and Horns--Leather Waste--Dried Meat--Dried Blood--Superphosphates-- Composition--Manufacture--Section of Manure-Shed--First and Ground Floor Plans of Manure-Shed--Quality of Acid Used--Mixings--Special Manures--Potato Manure--Dissolved Bones--Dissolved Bone Compound-- Enriched Peruvian Guano--Special Manure for Garden Stuffs, etc.-- Special Manures--Analyses of Raw and Finished Products--Common Raw Bones--Degreased Bones--Crude Fat--Refined Fat--Degelatinised Bones --Animal Charcoal--Bone Superphosphates--Guanos--Dried Animal Products --Potash Compounds--Sulphate of Ammonia--Extraction in Vacuo--French and British Gelatines compared--Index. Chemicals, Waste Products and Agricultural Chemistry.