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. Metallic salts, 13, 224, 227, 237, 247. "Metal proteids," 14. Meta-pectin, 70. Metaproteins, 175. Methylethylmalein imide, 108. Methyl glucosides, 42. Methyl pentoses, 35. Methyl salicylate, 81. Middle lamella, 67, 70. Millon's reaction, 173. Molisch's reaction, 174. Monoglycerides, 131. Monohydric alcohols, 135. Monosaccharides, 31, =35=, 45. Morin, 119. Morphine, 155, =158=. Morphological adaptations, 251, 252, =255=. Mucilages, 67, =70=. Muco-celluloses, 74. Muscarine, =152=. Mustard oils, 88, 148. Mustard oil glucosides, 88. Mutarotation, 46, 49. Myrosin, 77, 88, 149, 189. Myrtillidin, 85. Myrtillin, =85=. Narceine, 158. Narcotine, 158. "Natural selection," 254. Neurine, 152. Nicotine, 155, =156=. Nitrates, 6. Nitrile reaction, =43=. Nitriles, 43, 44. Nitrogen, 3, 5, 6, 151, =164=. Non-drying oils, 132. Non-essential elements, 4. Non-reducing sugars, 39, 49. Nonoses, 31. Normal celluloses, =72=. Nuclease, 189. Nucleoproteins, 162, 175. Nutrients, 1.