COXTi;\TS 



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liiirocUution 11 



('(•iiditions requiring consideralion 11 



1 iifliK'nce of short drought in same season J2 



1 nlUience of a dry season upon succeeding season 14 



« onirol by winter climatic conditions 15 



Kclalionship of factors of control 19 



Investigations showing control by heat, ants, and parasites 2?> 



Natural control in various c lasses of forms 20 



Desirability of retention or shedding of infested forms M 



Mortality in bolls vei-sus 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 



Efliciency of natural control in various sections 53 



Mortality in each class of forms for each section (iO 



Sections profiting most by natural control ()2 



Destruction of cotton forms by weevil attack or by natural causes (54 



Collections of fallen forms in 1905 (54 



Collections of fallen and of dried hanging forms in 1900 05 



Summary and conclusions 73 



I ndex 77 



7 



