PAPERS ON BIOLOGY AND AGRICULTURE 123 



the medium seeds are greater than those of the small or 

 large seeds. There is little difference in the case of soil 

 grown seedlings in the hypocotyl lengths of seedlings from 

 small and large seeds. There is less difference between the 

 length of the second and third internodes of seedlings from 

 medium and large seeds than between those from medium 

 and small of the same density. 



Weight. — From the data given for fresh root weight 

 (Tables 18 to 20) for water culture, we find that the aver- 

 age weight for seedlings from the small seeds of Density 



3 is greater than that of those from the medium or large 

 seeds of like density. The average weight for seedlings 

 from small seeds of Density 2 is greater than that of those 

 from the medium seeds of this density. Again, the aver- 

 age weight for seedlings from medium seeds of Densities 



4 and 5 is greater than that of those from large seeds of 

 these respective densities. The fresh weights for shoots 

 and plants vary, for equal densities, as the size of the seeds. 



The dry weights for seedlings grown in water also show 

 a relation to size of seed. In the roots of seedlings, those 

 from the small seeds of Density 3 nearly equal in average, 

 minimum and maximum dry weights the roots from med- 

 ium seeds of equal density. As between medium and large 

 seeds, seedlings from medium seeds of Density 4 surpass 

 those from the large seeds in minimum and average 

 weight ; and seedlings from medium seeds of Density 5 sur- 

 pass those from large seeds in average and maximum dry 

 root weight. In general, however, the weights of seedlings 

 grown in water from seeds of equal densities vary as the 

 size of the seed. The comparison of average dry plant 

 weight is given graphically in Plate II. 



Turning now to the data for average values in soil grown 

 seedlings (Tables 37 to 39) we find that, except for the 

 average weights of seedlings from medium seeds of Density 

 2, all average fresh weights vary as the size of the seeds 

 provided they are equal in density. In the exception just 

 cited the average weights for seedlings from medium seeds 

 is greater than that for those of the larger seed in the case 

 of root, shoot and plant weights. With but one exception, 



