KNOWLEDGE OF THE MUTATING OENOTHEEAS. 



49 



parentage. Again, 0. ruh7^ine7wis X 0. ZamarcJciana (the latter derived from a cross 

 with 0. lata) gave in one case (No. 115 X 77) 32 0. ruhrinervis , 5 O. LamarcUana, 

 and 1 which was uncertain. In another case (No. 121 X 78), with parents of the 

 same ancestry, the result was 49 0. ruhrinerxiis, 16 O. Lamarchiana^ and 1 O. lata. In 

 one case, from O. ruhrinervis X O. Lamarckiana, the P^ from a ruhrinervis plant of the 

 Pi gave 82 individuals exclusively 0. rubi'inerms, and a La/marc¥iana plant from the P^ 

 of the same cross yielded 19 plants purely O. Lamarckiana, hearing out DeVries's result 

 that splitting in the Eg does not occur. The data from these and three other crosses 

 are brought together in the following table : — 



Table V. 



Date. 



1906. 





Cross. 



1906. 



1906. 



0. lata X 0. Lamarckiana. F, 



1907. 



1907. 



1909. 



1910. 



1910. 



1909. 



1911. 



1907. 



1907. 



0. Lamarckiana, F^ (6 plants) . . 



0. ruhrinervis x 0. Lamarckiana, F^ . . 



0. ruhrinervis X 0. Lamarckiana, F^ . . 



0. ruhrinervis, F^ (1 plant) 

 0, Lamarckiana, F „ 



Number 



of 

 Plants. 



13 



104 





0. Lamarckiana x 0. ruhrinervis^ F^ . . 

 0. LamarcMana X 0, ruhricali/x, F^ . . 



0. ruhrlcahjx x 0. Lamarckiana^ F^ 



0. Lamarckiana x 0, gigas^ F^ 



>» 



X 



„ F, (2 plants) 



1907. 



1907- 



1910, 



1910. 



0. ruhrinervis X 0. naneUa^ F^ 



+ 



0, ruhrinervis X 0- naneUa, F^ 



0. lata X 0. ruhrinervis, F^ 



?» 



X 



»» 



F 



0. ruhrinervis X 0. nanella, F, 

 (9. ruhricalyx x 0. nanella, Fj 



38 



66 



82 



19 



68 



11 



4 



40 



44 



42 



3 



1 



4 



79 



42 



OFFSPRrNG 



0. Zaia 5 + 0. Lamarckiana 8. 



0. Lamarckiana 104. 



0, ruhrinervis 32 + 0. Lamarckiana 5+1 uncertain 



3) 



49 + 



^t 



16 + a lata 1 



0. ruhAnervis 82. 



0. Lamarckiana 19. 



0- Lamarckiana 22 + 0. ruhmnervis 45 + 1 mutant. 



0. Lamarckiana 2+0. ruhrinervis and 0. ruhricalyx 8 + 



1 mutant 



rM& 



0. Lamarckiana 40. 



0. Lamarckiana 44. 



0. Lamarckiana 20 + 0. ruhrinervis 20 + 0. Zato 1 

 0. Lamarckiana 1 + 0. ruhrinervis 2. 



0. ohlonga mutant. 



0. Lamarckiana 3 + 0. ?afa 1. 



The 0. Lamarckiana remained true in F^ and F^. 



0. Lamarckiana 25 (?) + 0. ruhrinervis 52 + 2 aberrant 



0. Lamarckiana 7 + 0. ruhricahjx 35. 



Though the numbers involved were small in several of these cases, yet the results 



sufficient as confirmatory evidence 



SECOND SERIES. ^ — BOTANY, VOL. VIII. 



H 



