MUTATIONS 281 
broader and of a deeper green, as is shown by Fig. 117. De Vries 
classified this form also as a progressive species. Albida and oblonga 
were classified as distinct but weak species, incapable of perpetuating 
themselves in a state of nature and hence were called “degressive.”’ 
The seventh form, scintillans, proved to be inconstant from the beginning, 
self-fertilized seed always producing some lamarckiana seedlings, as 
Fie. 117.—C. lamarckiana (left) and gigas (right), flower stalks and rosettes. (From de 
Vries.) 
well as scintillans, oblonga, lata and sometimes nanella. The two new 
forms found growing wild in 1886, levzfolia and brevistylis, never appeared 
among the experimental cultures but because they, like nanella, appeared 
to have lost something that characterized lamarckiana and to be dis- 
tinguished from it by one definite character, de Vries classified these 
together with nanella as “regressive” species or “retrograde” varieties 
at the same time pointing out that they possessed the qualifications of 
Digitized by Microsoft® 
