43
  " " softening of, 41
  " " waste of soap by, 43
  " hardness, temporary and permanent, of, 42
  " impurities in, 42
  " " effect of, in dyeing, 42
  " " ferruginous, 44
  " iron in, detection of, 46
  " latent heat of, 34
  " lead in, detection of, 47
  " lime in, detection of, 46
  " magnesium in, detection of, 46
  " purification of, 45
  " purity of, tests for, 46
  " soft, 40
  " effect of carbonic acid in hardening, 40
  " sulphates in, detection of, 24

Wood acid, 64
  " destructive distillation of, 64
  " spirit, 64

Wool, chrome mordanting of, 77
  " dead:  why it will not felt, 18
  " dyeing, with coal-tar colours, 105
  " felted, effect of boiling water on finish and strength of, 22
  " felted, effect of stiffening process on finish of, 66, 103
  " felting of, interlocking of scales in, 13
  " fibre, 8
  " " action of acids on, 23
  " " " of alkalis on, 24
  " " composition of, 22
  " " curly structure of, 15
  " " distinction between, and hair, 12, 14
  " " growth of, 8
  " " hygroscopicity of, 20
  " " structure of, from diseased sheep, 19
  " " sulphur in, reagents for detection of, 26
  " grease, 100
  " kempy, 19
  " merino, 15
  " mordanting, 75
  " scouring, 101
  " stripping of, 23

Woollen goods, indigo-dyed, recovery of indigo from, 24
  " " mixed cotton and, separation of, 5

Xylenes, 90

Yellow colour, absorption spectrum of pure, 114

Yolk. See Wool grease.

Abridged Catalogue

OF

Special Technical Books.

INDEX TO SUBJECTS.

PAGE

Agricultural Chemistry, 9
Air, Industrial Use of, 10
Alum and its Sulphates, 8
Ammonia, 8
Aniline Colours, 3
Animal Fats, 6
Anti-corrosive Paints, 4
Architecture, Terms in, 22
Architectural Pottery, 12
Artificial Perfumes, 7

Balsams, 9
Bleaching, 17
Bleaching Agents, 17
Bone Products, 8
Bookbinding, 23
Brick-making, 11, 12
Burnishing Brass, 20