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somewhat skew curves these values have been determined, since 
these curves do not considerably deviate from the symmetrical ones 
and besides, in all cases the average of both quartiles has been taken. 
Only from the semi-curve for the branches of the third order of 
[beris amara, fig. V, no constants were calculated. This curve will 
be dealt with later on. 
I give here the values found for the various characters in the plants 
studied in the same order as that of the curves of the plate. In the 
table, G means the constants of the well-fed, B those of the badly- 
fed plants. For each character are given: the median value, the 
quartile, the variability-coefficient and the minimum and maximum 
value. Besides the differences of these values in the well-fed and the 
badlv-fed plants have been calculated as well for the median as for 
the variability-coefficient. This difference, divided by the value for 
the well-fed plants and consequently expressed as a fraction of this 
value, I will call the sensibility-coesfcient of the median or the 
variability. This coefficient is given in. the table under the two values. 
A + sign for the sensibility-coefficient means that the value is 
greatest with the well-fed plants, a — sign that with these the value 
is smallest. 
It appears from this table as well as from the curves that in 
general the median value of the characters of the badly-fed plants 
is smaller than of the well-fed ones. Only with Mafra vulgaris the 
median value of the number of akenes of the plants from the sandy 
soil is slightly larger, the difference being very small, however. The 
sensibility-coefficient is only — 0.015. With the remaining characters 
the sensibility-coefficient of the median is positive and differs very 
much; on the whole it varies between 0.015 and + 0.54. 
Let us now see from the table whether nutrition has the same 
influence on the median value of the different characters of the same 
species. We shall leave Malva vulgaris out of account here 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 differences were very slight for all the characters considered. 
Comparing the sensibility-coefficients of the median of the various 
characters of one species, we find that they diverge largely. 
While the sensibility-coefficient of the median of the number of 
branches of the second order of /beris anura is — 0,54, it is 
+ 0,15 for the number of silicles of the principal stem ; the sensi- 
bility-coefficients of J/ for the length of the plant and the length of 
the leaf lie between these values and amount to + 0,24 and + 0,28. 
With Anethum graveolens the sensibility-coefficient of the median of 
