84 WEEVIL-RESISTING ADAPTATIONS OE COTTON. 



Page. 



Keleps, usefulness in comparison with ants 39 



value known by Indians 1 71 



visitation of other nectar-bearing plants than cotton 36 



Kidney cotton, adaptations 74 



at Trece Aguas, Guatemala 32, 53 



Tucuru, Guatemala 24, 66 



characters 67 



cultural value 67 



of American origin 9 



oil glands 53, 54 



origin of name 9 



protective features 42 



seed arrangement % 66 



thin outer wall of boll 66 



King cotton, behavior in Guatemala 17 



cluster variety 17 



dimensions of buds and bracts 40 



flaring of squares 40 



large nectaries 31 



proliferation 60 



rapidity of development 55 



Kinsler, J. H., observations 17, 29, 37, 47, 50, 51, 55 



plants cultivated in Guatemala 15 



Laciniae of involucral bracts 43 



Lanham, Md. , experiments 18, 25, 43 



Lanquim, Guatemala, planting of brown cotton 70 



Large varieties, disad vantages 19 



Late planting in northern localities 13 



Leaves, Kekchi cotton 16 



nectaries, general discussion 30 



Leavitt, E. G. , principle of translocation of characters 70 



Limbless variety of King cotton 17 



Lint, disadvantages 65 



protection of seeds 65, 66 



Locks, number in Kekchi cotton 16 



Mackay, Tex. , examination of cotton 75 



Maxon, W. R. , cotton obtained 25 



observations 70 



McLachlan, Argyle, observations *_ _ . 18, 25, 41, 47, 57, 60, 61, 75 



Melanthera deltoidea visited by keleps 37 



Mexican plateau, absence of weevils 11 



region , advantages 43 



Mexico, cotton culture 45. 



Mit Afifi cotton, oil glands 53 



Molds, growth in nectaries 30 



Moqui Indian cotton, character 52 



Mutations in Kekchi cotton 16 



Natural selection by boll weevil 54, 69 



cotton 9 



conscious and unconscious 70 



effect of oil glands 54 



illustration of influence in evolution 71 



. in simultaneous flowering 23 



not actuating cause of evolutionary change 68 



the explanation of adaptation 68 



Nectar, continued secretion by plants 32 



purpose 28 



secretion in Kekchi and Upland cottons 32 



on bolls 33 



Nectaries, external, discussion 31 



position in pendent bolls 27 



secretion ( 27 



extrafloral, connection with bacterial diseases 62 



discussion 28 



functions - 29 



