rocellulose, 73.
Hydrogen peroxide, 26, 27, 190.
Hydrogel, 205.
Hydrolases, 186, 189.
Hydroquinone, 77, 79.
Hydrosol, 205.
Hydroxy-phenyl ethyl amine, 153.
Hygrine, 155, 156.
Hyoscine, 155.
Hyoscyamine, =156=.
Hypoxanthine, =160=.

Idain, =85=.
Idose, 36, 37.
Illuminating gas as a toxin, 247.
Imbibition, 209.
Impermeable membranes, 228.
Indian yellow, =84=.
Indican, 78, =85=.
Indigo, 78, 84.
Indigotin, 85.
Indole, 158.
Indoxyl, 85.
Inhibitors, 196.
Intracellular enzymes, 184.
Inulin, 59.
Inulinase, 62, 189.
Invertase, 50, 189, =191=.
Invert sugar, 47, 50.
Iodine number, 138.
Ionization phenomena, 226.
Iridin, =79=.
Irigenin, 79, 80.
Iron, 3, 5, 11, 110.
Isochlorophyllin _a_, 106, 107, 108.
Isochlorophyllin _b_, 106, 107, 108.
Isohaemopyrrole, 109.
Isoleucine, 168.
Isomaltose, 51.
Isomerism, 32.
Isoprene, 147.
Isoquercitrin, 84.
Isoquinoline, 155.

Jalapin, =81=.
Japan wax, 129.
Juglansin, 176.

Ketose, 32.

Lactam, 104.
Lactase, =56=.
Lactic acid ferment, 190.
Lactone, 104.
Lactose, 45, 49, 52.
Laudanosine, 158.
Laudanum, 158.
Lecithin, 7, =141=, 142, 143.
Lecithoproteins, 175.
Legumelin, 176.
Legumin, 170, 176.
Leucine, 115, 168, =177=.
Leucomaines, 152.
Leucosin, 176.
_l_-galactose, 33.
_l_-glucose, 33.
Levulosans, 59, =62=.
Levulose (_see_ fructose).
Lichenin, =62=.
Light, 21, 253, 257.
Lignocelluloses, =74=.
Lignose, 31.
Limettin, =82=.
Limonene, 147.
Linalyl acetate, 148.
Linseed oil, 133.
Lipases, 186, 189.
Lipins (_see_ lipoids).
Lipoids, 129, =140=.
Lipoproteins, 175.
Lupinine, 155.
Lycopersicin, 102, 122, =114=.
Lysine, 169, 171, 177.
Lyxose, 35.

Magnesium, 3, 5, 9, =10=, 11, 13, 14, 68.
Maltase, 55, 184, 189.
Maltose, 45, 49, =51=, 52.
Malvidin, 85.
Malvin, =85=.
Mandelo-nitrile, 78, 88.
Mandelo-nitrile glucoside, 77, 87.
Manganese, =4=, 13.
"Manna," 47.
Mannans, 59, 62, =63=, 72.
Mannite, 47.
Mannitol, 47.
Mannitol series, 36.
Mannoheptose, 36, 44.
Mannononose, 36.
Mannooctose, 36.
Mannosans (_see_ mannans).
Mannose, 32, 36, 37, 41, 44, 45, =47=, 57, 72.
Mannosides, 42.
Maple sugar (_see_ sucrose).
Maysin, 176.
Melibiose, 49, =52=.
Melizitose, =52=.
Menthol, 148.
"Mercerizing" cotton, =73=.
Mercury, 247.
Merosinigrin, 88.
Me