CONTENTS 



seed The endosperm The embryo The seed-coats 

 Development of the lint Tabulated chronology of 

 boll development ..... 51-85 



CHAPTER IV 



THE DEVELOPMENT OF THE BOLL: 

 II. ENVIRONMENTAL INFLUENCES 



Introductory Age of boll Material studied. Dated Flowers 

 Experiment of 1912 : Statistics Soil water Alteration 

 in lint from day to day Average properties of a bale 

 Independence of properties Possible relations of 

 strength and length Statistical methods Length de- 

 graded by water shortage Utility of pure strains 

 Length and strength due to the same causes The seed 

 Ginning out-turn Out-turn and quality not necessarily 

 connected Possible causes of out- turn fluctuations 

 The cause Significance of out-turn Special and general 

 behaviour of crops -Weight of single lint hairs Lint 

 hair weight equivalent to hair strength Number of 

 hairs per seed Grading and strength Uniformity and 

 strength. Daily pickings of 1913 : Hastening maturity 

 Length of lint Fluctuating length Effect of irriga- 

 tion Strength of lint Greater fluctuation Short- 

 period picking Quality of pickings Water-table and 

 lint quality Differences between pickings Canal rota- 

 tions Classification of pickings Uniformity in cotton 

 Plant to plant fluctuation Hair to hair fluctuation 

 Uniformity and changes of environment Summary 86-123 



CHAPTER V 



THE DEVELOPMENT OF COMMERCIAL LINT 



Introductory Spinning and growing The meaning of 

 " strength " Impurity of commercial varieties In- 

 dependence of inherited characteristics Characters of 

 growth habits Natural selection Uniformity and cul- 

 tivation The limitations of good cultivation Con- 

 stitution of Egyptian varieties Relative importance of 

 seed and cultivation Colour impurity Plants of one 

 variety Origin of the commercial product Properties 

 of the same Colour modifications The significance of 

 lustre The storage of seed-cotton The kinds of 

 " strength " Diameter Diameter affected by hair 

 strength Fineness Interpretation of grader's terms 



