294 



DR. L. H. GOUGH. 



This becomes most evident on examining Table XI, in which the sound seeds 

 derived from five samples have been arranged in 10 mg. weight groups and their 

 germination worked out. As was to be expected, the heaviest seeds gave the 

 most perfect germination.* Complete germination was obtained in all seeds above 

 120 mg. in weight ; satisfactory growth was obtained from those ranging from 

 100-119 mg. Seeds lighter than 90 mg. gave increasingly unsatisfactory results 

 in proportion to their decreases in weight. The correlation between seed-weight 

 and germination is - 958 + - 014. 



Table XI. To show Correlation between the Weight of Cotton Seeds and their 

 Power of Germination, being the Germination of all the Sound Seeds from 300 Bolls. 



Weight groups 



Number of seeds. 



Percentage 



in 







of 



milligrams. 



Total. 



Germinated. 



germination. 



160-169 



1 



1 



100 



(165) 

 150-159 



2 



2 



100 



(155) 

 140-149 



3 



3 



100 



(145) 

 130-139 



14 



14 



100 



(135) 

 120-129 



67 



67 



100 



(125) 

 111-119 



122 



113 



93 



(115) 

 100-109 



271 



221 



82 



(105) 

 90-99 



196 



150 



77 



(95) 

 80- 89 



255 



130 



58 



(85) 

 70- 79 



207 



73 



35 



(75) 

 60- 69 



189 



51 



27 



(65 

 50- 59 



83 



16 



19 



(55) 



40- 49 



63 



5 



8 



(45) 

 30- 39 



22 



3 



14 



(35) 

 20- 29 



17 



1 



6 



(25) 

 10- 19 



1 











(15) 



0- 9 



(5) 















Weighting as in Table VII ; r= 0-958 ± 0.014. 



There can consequently be no doubt that Gelechia indirectly affects the germina- 

 tion of sound seeds which have developed in attacked bolls, by reducing their 



* See Balls W. L. The effect of Seed-Weight on the Field Germination of Cotton Seed. - 

 Cairo Scientific Journal, No, 47, Aug. 1910. 



