F. L. Engledow and J. P. Siielton 'JOS 



(ii) Nevertheless, the ratio of these two quantities has about as big 

 a coefficient of variation as the absolute glume-length. 



(iii) Therefore, despite contrary expectations, the ratio appears to 

 be of no special value in investigation. 



(iv) Among the tillers of any one plant correlations e.xist for glume- 

 length, rachis-length, and ratio. Their general value is about + 0-5 and 

 consequently when dealing with attributes of this kind observation 

 should be confined to the main stalk of every plant. 



(v) It is desirable further, to restrict the experimental population 

 to ])lants all of which produce the same number of tillers. 



(vi) Weight of mother-seed, for a reasonably good seed sample, 

 seems not to determine in any observable degree the growth of the 

 resulting plant as judged in general by glume-length, rachis-length, and 

 the ratio of these two. 



(vii) The great labour of picking out for sowing a sample of seeds 

 all of one weight in order to reduce "fluctuation"' among the resulting 

 plants, seems not likely to be repaid. 



BIBLIOGRAPHY. 



(1) Engledow, F. L. (1920). The lulieritance of Glume-Length and Grain-Length 



in a Wheat Cross. Journ. Genelics, 10, No. 2. 



(2) Haklan, H. V. (1920). Daily Development of Kernels of Hanuchen Barley from 



Flowering to Maturity at Aberdeen, Idaho. Journ. Agric. Research, 19, No. 9. 



(3) Gates, R. Ruggles (1915). On the ModiKcation of Characters by Crossing. 



Am. Nat. 49. 



(4) Engledow, F. L. (1920). Inheritance in Barley, No. I. Joiirii. Ornelirs, 10, No. 2, 



ajid No. II. Journ. Agric. Sci. 11, 1921. 



(5) JIabtin Leake, H. Studies in Indian Cotton. Journ. Griirlics. 1. 

 (0) Balls, W. L. (1909). Studies of Egyptian Cotton. 



(7) CJroth. Bulletins of the New Jersey Experiment Station, Nos. 228, 238, 239, 242, 



278. 



(8) KiDD, F. and West, C. (1919). Physiological Predetermination; the Influence 



of the Physiological Condition of the Seed upon the Course of the Subsequent 

 Growth and upon the Yield. Ann. App. Biol. 5, Nos. 3 and 4. 



{Received 1st June, 1921.) 



