wool. _See_ Wool.

Fibres, action of acids on textile, 5
" " alkaline solution of copper and glycerin on textile, 28
" " alkalis on textile, 5
" " caustic soda on textile , 28
" " copper-oxide-ammonia on textile, 28
" " nitric acid on textile, 28
" " steam on textile, 5
" " sulphuric acid on textile, 27

Fibres, animal, 6
" bast, 3
" vegetable, 1
" " and animal, determining, in mixture, 27
" " and animal, distinguishing, 4, 5
" " and animal, distinguishing and separating, 24

Fibroin, 7

Flax fibre, action of basic zinc chloride on, 5
" composition of, 3
" structure of, 2

Fraunhofer's lines, 111, 112

Fur, 8
" action of acids on, 23
" " of alkalis on, 24
" " on, in secretage process, 17
" chrome mordanting of, 77
" composition of, 22
" felting, 15
" finish and strength of felted, effect of boiling water on, 22
" hygroscopicity of, 20
" preparation of, for felting, 18
" secretage or carrotting of, 17
" stiffening and proofing of felted, 66
" sulphur in, reagents for detection of, 26

Fustic, 99

Gallein, 82, 83

Gallnuts, 99

Garancine, 99

Guy-Lussac tower, 52

Glover tower, 52

Glucose, 4

Greening of black hats, 65

Haematein, 76, 78 83, 99

Hair, 8
" cells from, 11
" distinction between, and wool, 12, 14
" dyeing, 26
" growth of, 8
" scales from, 11
" " of, action of reagents on, 12
" scaly structure of, 11
" structure of, 8, 9
" sulphur in, reagents for detection of, 26

Hargreaves & Robinson's process, 53

Hats dyed logwood black, deterioration of, 104
" greening of black, 65
" stiffening and proofing of, 63, 64
" stiffening and proofing of, by Cheetham's process, 66
" stiffening and proofing of, by Continental process, 66
" stiffening and proofing process, effect of, in dyeing, 65, 103

Heat, latent, 32, 33
" " of steam, 34
" " of water, 34

Heddebault's process of separating mixed cotton and woollen goods, 5

Hydrochloric acid, manufacture of, by Hargreaves & Robinson's process, 53
" " manufacture of, by salt-cake process, 53

Ice, heat of liquefaction of, 34

Ice-making machine, Carre, 32

Indican, 85

Indicators, 50, 70

Indigo, 85
" artificial, 8