CONTENTS. 



Page. 



Introduction ; 11 



Conditions requiring consideration 11 



Influence of short drought in same season '12 



Influence of a dry season upon succeeding season II 



Control by winter climatic conditions 15 



Relationship of factors of control 19 



Investigations showing control by heat, ants, and parasites 23 



Natural control in various classes of forms 26 



Desirability of retention or shedding of infested forms 31 



Mortality in bolls versus squares 33 



Natural control in various localities 35 



Influence of climatic conditions especially 39 



Influence of cultural conditions 43 



Influence of period of infestation upon natural control 51 



Efficiency of natural control in various sections 53 



Mortality in each class of forms for each section 60 



Sections profiting most by natural control (52 



Destruction of cotton forms by weevil attack or by natural causes 64 



Collections of fallen forms in 1905 64 



Collections of fallen and of dried hanging forms in 1906 65 



Summary and conclusions 73 



Index ! 77 



7 



