PAGE Abraxa grossulariata, 105,193 Aceras hircina, local variability, 123 Achatinellidae, local forms of, 133 Acquired characters, inheritance of, 188 et seq.,217,233 Acronycta psi, melanic, 138 Adaptation, problem of, 187,234 Agelaius, local forms, 120 Agrotis, fixed and variable species, 25 Alkaptonuria, 83 Alpine Plants, growing larger, if protected, 183 Alpine Varieties, 165 Alytes obstetricans, Kammerer's experiments on, 199,210 Amblystoma, races of, 230 Amphidasys betularia, melanic form, 136,138 dimorphic larvae, 141 Anodonta, polymorphism of, 130 Antirrhinum, striped, 57 species-hybrids, 99 albinos, 110 Apple, will not cross with pear, 239 Arctia caja, effects of temperature, 192 larval variation in, 231 Arctic varieties, 165 Argynnis paphia and valesina in Italy, 121 Armadillo, polyembryony, 42 Artistic faculty, 89 Arum, rights and lefts, 57 Auriculas, short-styled selected, 236 Axis of symmetry in hand and foot, 48 Axolotl, alleged effect of conditions, 230 Azalea, bud-sports, 55