===============+======+======+======+======+========+========+====+======== GENERATION |GIGAS |ALBIDA|OBLON-|RUBRI-|LAMARCK-|NANNELLA|LATA|SCINTIL- | | |GATA |NERVIS| IANA | | | LANS ===============+======+======+======+======+========+========+====+======== |8 Gener. | VIII | 1899 | 5 1 0 1700 21 1 |annual | ‘———————————v—————————’ | | |7 Gener. | VII | 1898 | 9 0 3000 11 |annual | ‘———————v——————’ | | |6 Gener. | VI | 1897 | 11 29 3 1800 9 5 1 |annual | ‘———————————v—————————————’ | | |5 Gener. | V | 1896 | 25 135 20 8000 49 142 6 |annual | ‘———————————v—————————————’ | | |4 Gener. | IV | 1895 | 1 15 176 8 14000 60 73 1 |annual | ‘—————————————v—————————————’ | | |3 Gener. | III | 1890-91 | 1 10000 3 3 |biennial | ‘———v——————————’ | | |2 Gener. | II | 1888-89 | 15000 5 5 |biennial | ‘—v——————————’ | | |1 Gener. | I | 1886-87 | 9 |biennial | =====+=========+=========================================================== These two new forms, as well as the common _O. lamarckiana_, were collected, and from these plants there have arisen the three groups or families of elementary species that De Vries has studied. In his garden other new forms also arose from those that had been brought under cultivation. The largest group and the most important one is that from the original _O. lamarckiana_ form. The accompanying table shows the mutations that arose between 1887 and 1899 from these plants. The seeds were selected in each case from self-fertilized plants of the _lamarckiana_ form, so that the new plants appearing in each horizontal line are the descendants in each generation of _lamarckiana_ parents. It will be observed that the species, _O. oblongata_, appeared again and again in considerable numbers, and the same is true for several of the other forms also. Only the two species, _O. gigas_ and _O. scintillans_, appeared very rarely.