28 



It appears from this table as well as from the curves 

 that in gênerai the médian value of the characters of the 

 badly-fed plants is smaller than of the well-fed ones. Only 

 with Malva vulgaris the médian value of the number of 

 akènes of the plants from the sandy soil is slightly larger, 

 the différence being very small, however. The sensibility- 

 coefi&cient is only — 0.015. With the remaining characters 

 the sensibility-coefficient of the médian is positive and 

 dififers very much; on the whole it varies between — 0.015 

 and -f- 0.54. 



Let us now see from the table whether nutrition has 

 the same influence on the médian value of the différent 

 characters of the same species. We shall leave Malva vul- 

 garis out of account hère since, as was mentioned above, 

 its roots had in the bed of unfertile earth penetrated into 

 the fertile underground and possibly on this account the 

 différences were very slight for ail the characters conside- 

 red. Comparing the sensibility-coefficients of the médian 

 of the varions characters of one species, we flnd that they 

 diverge largely. 



While the sensibility-coefficient of the médian of the 

 number of branches of the second order of Iberis amara 

 is + 0.54, it is + 0.15 for the number of silicles of the 

 principal stem; the sensibility-coefficients of M for the 

 length of the plant and the length of the leaf lie between 

 thèse values and amount to -h 0.24 and -|- 0.28. With 

 Anethum graveolens the sensibility-coefficient of the médian 

 of the number of umbel-rays is 4- 0.44, that of the number 

 of lobes of the first leaf only -\- 0.08. To some extent this 

 may be explained by the circumstance that the influence 

 of nutrition on the first leaf is not so great as on charac- 

 ters which appear later, since the food, stored in the seed, 

 is the same for both cultures and possibly has not been 

 entirely used when the first leaf develops. In agreement 

 with this the sensibility-coefficient of the médian of the 



