654 



Geological Periods of Mutation. 



Oe^.La rn. 



Fig. 148. Pedigree of Ocnotlicra Lamarckiana, exhibiting 

 the yearly origin of new species in my experimental 

 garden in the years 1889-1899. g, O. gigas; a, O. albida; 

 It, O. lata; 11, O. nanella; r, O. nihrincrvis; o, O. oblonga; 

 s, O. sciufillans. The numbers preceding the letters are 

 those in which the species in question arose. The num- 

 bers on the main stem show the extent of the yearly cul- 

 tures. 



