I04 THE COTTON PLANT IN EGYPT ch. v 



The extent of this fluctuation is determined on the mean 

 maximum lint-length of five seeds taken at random from 

 the plant, and gives such results as a P.E. of ±2'9 per 

 cent, on a mean of 33 "5 mm. 



Taking single seeds only, we obtain such results as those 

 shown in Fig. 49. There is a definite bi-modality in some 

 of these graphs ; probably further investigation of such 

 modes will show us how to persuade a plant into the 

 production of abnormally long lint as a normal product. 



