120 ILLINOIS STATE ACADEMY OF SCIENCE 



from seed of Density 4, the second highest, of Density 1; 

 the two highest for the medium seeds are from seeds of 

 Density 3; the highest for the large seeds is from Density 

 2 while the second highest is from Density 3. The mini- 

 mum value for each size group is in a seedling from seed 

 of the lowest density. 



No correlation exists between density and average and 

 maximum length of hypocotyl and first internode. The 

 lengths of the second and third internodes vary as the 

 density of the seeds. No seedlings grown in soil developed 

 a fourth internode. As to the diameter, we find the aver- 

 age size varies as the density of the seed ; the maximum 

 values are also in the diameters of the seedlings from seeds 

 of the higher densities. 



In so far as size of seedlings is concerned, the results 

 agree in general with those for water grown seedlings, — 



(1) The greatest height and diameter of shoot is found 

 in seedlings from the seeds of Densities 1, 2 and 3. More 

 often in seedlings from Densities 2 or 3 than Density 1. 



(2) The length of the second and third internodes vary 

 as the density of the seed. 



Weight. — There is more variation in the fresh weight 

 of soil-grown seedlings than in those grown in water. This 

 is especially true in the root weight. In the roots of seed- 

 lings from small seeds the greatest average and maximum 

 weights are for those from the higher densities and the 

 minimum weights are in those of lower densities, but no 

 general relation seems to exist between fresh root weight 

 and specific gravity for seedlings from the medium and 

 large seeds. 



In the fresh shoot weights we have the greatest average 

 weights for the small, the medium and the large seeds in 

 those from seeds of Densities 1, 2 and 3 respectively. The 

 maximum fresh weight for each size group is in a seedling 

 from a seed of Density 3 while the minimum weights are in 

 those from Densities 5 or 6, usually 6. In the fresh plant 

 weights we find the same order as in the shoot weights 

 the greatest average weights for small, medium and large 

 seeds are in seedlings from seeds of Densities 1, 2 and 3 



