CONTENTS 



CHAPTER I 



THE DEVELOPMENT OF PEDIGREE 



PAGES 



Object of classification Genealogical trees Classificatory 

 characters in cotton Origin of cotton Evolution of 

 various types of cotton Three main branches Evolu- 

 tion of lint Utility of the lint Wind distribution 

 Evolution of fuzz Effect of one characteristic on others 

 Fluctuation. Commercial varieties : Subspecies Ele- 

 mentary species Improvement of cultivated cotton 

 Extinct elementary species Natural crossing Origin 

 of commercial varieties Deterioration of varieties 

 Seed renewal Yield and breed Modern ideas Pre- 

 cision Variability of cotton Interpretation of popular 

 expressions - 1-20 



CHAPTER II 



THE DEVELOPMENT OF THE PLANT 



Introductory Stunting Sowing-time Poisoning by heat 

 The temperature of the plant Limiting factors 

 Water and germination Water and the plant Water 

 and the crop Effect of sunshine The events of one 

 day Suitable soil Spacing of the plants The root 

 Deep draught of the root Alkali soils Manures 

 Plant scaffolding Variable characteristics Branches 

 Cotton-producing machines Senescence Rejuvena- 

 tion Crop forecasts Shedding The boll Construc- 

 tive and modifying factors - - 21-49 



CHAPTER III 



THE DEVELOPMENT OF THE BOLL : 

 I. STRUCTURAL 



Introductory Previous authors Cause of former errors 

 Material The flower-bud The flower The fruit- 

 General Development of the boll Development of the 

 viii 



