The Lamarckiana-F amily . 225 



in the table : others have arisen, but they have either not 

 flowered or, being partially sterile, have set no seed ; or 

 are of minor importance for other reasons. As examples 

 of such we may just mention O. sublinearis and 0. suh- 

 ovata and two or three allied types, which could not be 

 distinguished with certainty because they bore no seed. 

 From others as, e. g., O. leptocarpa, 0. elliptic a, and O. 

 seviilata I have made sowings with successful results 

 although the experiments were carried out on a small 

 scale (cf. §§ 16-20). In the case of one form, O. spathu- 

 lata, I have so far only obtained rosettes, and the same 

 is true of other forms to which I do not propose to give 

 special names. 



The above-mentioned 0. laevifolia and O. hrevistylis, 

 which were found in the original locality never appeared 

 in my cultures. 



The numbers on the table show that my experiment 

 dealt in seven generations with about 50,000 plants and 

 that of these over 800 mutated; i. e., about 1.5%, a figure 

 which must for many reasons be regarded rather as too 

 small than too large. In the case of every mutated in- 

 dividual it is certain that since 1886 its ancestors w^ere 

 normal 0. Lamar ckiana. 



Whether this was the case with the earlier ancestors 

 is obviously now beyond the range of proof, but it mav 

 be assumed to have been so with a great degree of prob- 

 ability because of the extreme rarity of forms that 

 showed any deviation in the field at Hilversum. 



