58 DIMORPHIC LEAVES IN RELATION TO HEREDITY. 



Page. 



Picea, habits of branching -10 



Pinus, example of hoteroblasty 45, 47 



Plagiotropes, application of term 40 



Plant lice. Sec Lice, plant. 



Plants, self-fertilized, importance of sexualit y 45-46 



Pods, variant forms, in relation to leaf forms 24 



Populus, example of cladoptosis -. 44 



Potato, example of dichogeny 42, 45 



Qiierciis, example of cladoptosis 44 



modification of leaves in shade 34 



Ranunculus aquatilis, example of dichogeny 45 



Recapitulation, shows permanent transmission 28, 49 



Regression, relation to dimorphism 35 



Reproduction, physiology 50 



Reversion, mutative, occurrence and meaning 28-29 



Robinson, T. R., on occurrence of wild cotton in Florida 31 



Ropic species. See Species. 



Ropogeny , application of term 43, 45 



Roselle. See Hibiscus sabdariffa. 



Roxburgh, William, on appearance of Hibiscus cannabinus 16 



Rubber tree, Central American. See Castilla. 



Seedlings, of Egyptian cotton 19 



of Upland cotton 14, 17, 18 



transitions in leafage 47, 48 



Selection, use in maintaining uniformity 7-8, 9, 28, 35 



See also Breeding. 



Self-fertilization, relation to uniformity of strains 9-10 



Self-fertilized plants. See Plants, self-fertilized. 



Sex, comparison with alternative expression 35 



differentiation, relation to dimorphism 45-51 



Shoemaker, D. N., on cotton hybrids 36, 37 



Solanum tuberosum. See Potato. 



Specialization, dimorphic, different types 38-45 



Species, ropic and arropic 38, 39 



Spencer, Herbert, on occurrence of anisophylly 41 



Stabile induction. See Induction. 



Sterility, relation to dimorphism 7 



Stipvdes, abnormal, in Egyptian cotton 26, 52 



dimorphism in cotton 20-2 1 



Structure, analogous, of plants and animals 46, 49 



Sunlight, effect on leaves of plants 42 



Tanta, Egypt, occurrence of broad-leaved Hibiscus cannabinus 15 



Technical terms. See Terminology. 



Temperature, factor of development in plants and animals 49 



Terminology, definitions of dimorphic specializations 39-40, 44-45 



Texas, field of observations in dimorphism 17-18, 19, 36, 37 



Theobroma bicolor, dimorphic leaves 43 



cacao, example of hypophylly 44 



Transmission, alternative, not essential in Mendelism 38 



distinguished from expression 8-9, 51 



221 



