86 WEEVIL-RESISTING ADAPTATIONS OF COTTON. 



Page. 



Proliferation, probable effects of culture 50 



summary of results of study -13 



time required 60 



value §0 



Protection afforded by adaptations, commercial value 76 



when most effective 74 



the involucre 37 



tough linings of chambers of bolls 56 



by keleps, efficiency 34, 35 



of seeds by lint : 65 



Protective characters, first originated by cotton plant 68 



general 1 1 



of bolls 51 



value of involucre 37 



Quaintance, A. L., observations '. 52 



Rabinal cotton, adaptations 73 



bolls fed upon by boll weevils 61 



characters -11 



hairiness -5 



involucres 37, 38 



nectaries 31 



Guatemala, ants - - 39 



cotton culture 9, 38 



customs of Indians 24 



Rain, effect at time of flowering 21 



Redshank cotton, characters - 53 



large nectaries _^ 31 



Retalhuleu district of Guatemala, cotton planted -^'^t 



Rivers cotton, character in Guatemala 17 



Rubber, Central American, branches compared with those of cotton 19 



8ajal, plant often visited by keleps 37 



Salama, Guatemala, cotton culture of Indians 24 



San Lucas, Guatemala, Sea Island cotton 24 



adaptations 74 , 



attai'ked by other insects 32 



discovery 50 



nectaries 32 



Schwarz, E. A., observations 42, 48 



on Cuban cottons 23 



Sea Island cotton, Guatemalan, discovery 50 



nectaries 32 



of San Lucas, Guatemala, annual flowering 24 



cottons, comparison of petals with Upland varieties 26 



flaring of squares _ 40 



involucral bracts 37, 38 



lacking in protective features 4 



less hairy than Upland varieties 25 



not immune to boll weevil 42 



oil glands 53 



' origin 8 



precocity in Guatemala 17 



smoothness a disadvantage to keleps 25 



Seeanquim, Guatemala, cotton grown in vicinity 15 



experiments 39, 41 



Seed, low germination in Guatemala 15 



Seeds, protective arrangement in Kidney cotton _ 66 



Selection, conscious, unconscious, natural, and artificial, discussion 1 1, 70, 71 



in cotton, time required , -. 10 



provided by l)f)ll weevil 10 



Selective influence of boll weevil 10 



Short season varieties of cotton 1 2, 14, 22 



Soleriopsls pirea, ant inhabiting Rabinal cotton 39 



Specific tyi)e, generalized, the product of diversity and interbreeding 68 



Squares, boll weevil injuries 41 



flared and fallen, countings 45 



flaring .' 40, 41 



