94 



THE COTTON PLANT IN EGYPT chap. 



The same figure (Fig. 48) also shows the fluctuation in 

 the growth curve, which can be obtained by following the 

 same plant from date to date. 



10 20 30 40 SO eO 70 80 90 100 110 120 130 140 150_160 170 180 190 



Centimetres 

 Fig. 48. — Height op Stem. 

 Wide-sown, pure strain "77." 

 This figure is a reproduction of a page in the " Ledger " of this strain. 



The correlation of fluctuations in height with the fluctua- 

 tions of other characters has occasionally been interesting. 

 The most curious result was obtained in this same family 

 77, with respect to the leaf-length. The latter was 

 measured in the first week of September ; plotted against 



