226 



INDEX 



Mean error, 30 



Mean value, 29, 147, 161, 166, 173 ; 



use of, 176 ; relation with variation 



steps, 176, i8i 

 Mechanical concordance, 196 

 Melandrium, 17 

 Melica, 219 

 Melon, 195 

 Mendel, Gregorius, 21, 32, 65, 115, 134, 



139 

 Mendelism, 134, 215 

 Mentha, 21 

 Meristic variations, 69 

 Miers, Sir Henry Alexander, i 

 Mimosa, 78 

 Minimal value, 175 

 Mixtures, 4 

 Mnium, variation in, 28, 69, 182, 188, 



190, 202 

 Mobilis cstas, 57 

 Monocotyledons, 179 

 Monotypic species, 14 

 MoYUs, 91 



Mosses, 104, 106, 108, 109, 178 

 Muscle, contraction of a, 50 

 Mutation, 7, 8, 16, 141, 215 

 Mycology, 210 

 Myosotis, 191, 194, 196 

 Myxomycetes, 79 



N 



Naegeli, 35 , 79 

 Narcissus, 112 

 Nautilus. 113 

 Nectarine, 195 

 Nicotiana, 6 

 Nigella, 183 

 Nucleus, 5 



Obliquangular system, 109 



Oblique (false) axes, 108 



CEnothera biennis, 21, 38 ; constant 



hybrid, 38 

 Oils (fixed), 2 

 OnagracecB, 181 

 Ophiocama, 29 

 Opium, 4 

 Optimum, 168 

 Orchids, 78, 81, 92 

 Owen, R., 66 



PEDOGENESIS, 205 



Paedogenetic state, 52, 59, 205 

 Palaeontology, 212 

 Papaver, 4, 57, 183 

 Partula, 114 

 Patella, 113 

 Pea, 32, 134 



Peach, 195 



Pearson, Karl, 31, 183 



Pecten, 109, 178 



Pediastrum, 78, 178, 180 



Pelecypods, 113 



Percy Groom, 200 



Perennials, 92 



Personal equation (coefficient), 49 



Phajus, 73 



Phallus, 6, 7 



Philodendron, 12, 43 



Phleum, 18, 20, 176, 209 



Phloem, 112 



Phyllotaxis, 48, 190 



Pigeon, 195 



Pinus, 196 



Pisum, 32 



Planorhis, 212 



Plasticity, 9, 52, 58 



Plastids, 5 



Plateau, Josef, 49 



PleuYococcus, 94, 97 



Plum, 16 



Poa, 112, 175, 199, 204 



Polygonum, 10, 44, 48 



Polyps, 77, 79, 81 



Poppy. 183 



Possibilities, 9, 26, 36 



Potato, 16 



PotentiaUties, 9, 26, 36 



Potentilla, 17 



Prasiola, 97 



Priestley, 64 



Primordia, 40 ; classification, 66, 69, 

 74, 87, 89 ; classified according to 

 their development, 55 ; accrescent, 

 56 ; arrested, 54 ; awakening, 53 ; 

 caducous, 54 ; deciduous, 54 ; meta- 

 morphic, 53 ; original, 53 ; transi- 

 tory, 54 ; independence of, 204 ; 

 leading, 61 



Primula, 13, 18, 55, 185, 191 



Primulacecs, 67 



Probability, 118 



Probable error, 30 



Progressive mutation, 59 



Properties, combination (co-existence) 

 of, 47 ; possible and observable, 9, 

 26 ; simple and compound, 40. 

 See Primordia 



Proteins, 3, 5 



Prunus, 16, 192 



PseudochcBte, 84 



Pseudoclytia, 28 



Puccinia, 103 



Pure lines, 15, 31, 216 



Pyrus, 91 





Q 



Quantitative method, 26, 115, 

 various applications, 207 



144 



