122 ILLINOIS STATE ACADEMY OF SCIENCE 



(1) The greatest height and diameter of shoot are 

 found in the seedlings grown from seeds of the three high- 

 est densities; 



(2) The higher the density of the seed, the longer the 

 second and third internodes; 



(3) As a rule, the seedlings from the denser seeds have 

 the highest fresh weight; 



(4) The greatest dry weight is always found in seed- 

 lings from seeds of the three highest densities; 



(5) The seedlings from the higher densities show, on 

 the whole, a greater rate of growth than do those from 

 seeds of the lower densities. 



2. Relation of Growth to Size of Seed, at 25° C. 



Size. — That a definite relation exists between size of 

 seed and amount and rate of growth is shown beyond a 

 doubt by the results of these experiments. For both water 

 and soil cultures the seedlings from small seeds are smaller 

 than those from medium and large seeds in height and 

 in diameter of shoot. This fact in regard to shoot height 

 is clearly shown in Plates I and III. From these plates we 

 see that the seedlings from small seeds are not only shorter 

 than those from medium seeds of the same density but the 

 seedlings from the small seeds of the highest density are 

 shorter than those from the medium seeds of the lowest 

 densities. Both the numerical data and these plates show 

 that there is less difference in height between the seed- 

 lings from medium and large seeds than there is between 

 those from medium and small seeds. The average heights 

 for seedlings from the medium seeds from Densities 3 and 

 5 (Table 19) are greater than those from the large seeds 

 (Table 20) of the same densities. The maximum heights 

 for seedlings of Densities 1, 3 and 5 are also greater than 

 the maximum heights for the large seeds of the same den- 

 sities. 



There is a greater difference between the diameters of 

 the seedlings from small and medium seeds than between 

 those from medium and large seeds. The lengths, both 

 average and maximum, of the hypocotyls in seedlings irom 



