1907] GA TES—H YBRIDIZA 



s 



When 



and 



some 



more 



any cross 



may be taken as an 



In 



experiment'* 



18 per cent., Q. nanella 47 per cent., O. nanella-lata 5(?) per cent. 

 The constant intermediate hybrid type O. nanella-lata is usually 



from this cross, and 



vary 



breed 



The O. Lamar ckiana and O. nanella hybrids from this 



Since 



mature 



self-pollination. 



One other instance of a cross between two mutants (O. ruhri- 



nervtsXO. nm 

 of the results- 



Fourtli generation; 

 self-pollinated ipor 



Third generatioa; 

 seli -pollinated 1900 



constant 



constant 



nibrinervis 

 (without 

 nanella) 



Lamarckiana rubrinervis 



nanella- 

 rubrinervis 

 (17-22%) 



constant 



Second generation; Lamarckiana rubrinervis 



self-pollinated 1895. 



I 

 rubrinervis 



nanella 



nanella- 

 rubrinervis 



18 



% 



First generation ; Lamarckiana 



self-poUinated 1894. 



rubrinervis 



Crossed in 1893. 



rubrinervis X nanella 



^ 



case (DeVejes 



nervis 



was constant 



'ubrinervis^ part of which were Dure and 



tana 



ruhrinerv 



generation; (3) O. nanella 

 O. nanella-rubrinervlSj whic 

 tions. The form O. nane 

 between O. rubrinervis and 



a-rubrinervis as 

 constancy was 

 constant throuj 



(4) 



rubrinervis is an intermediate type 

 nanella: it has never appeared as a 





^DeVries, Hugo, Ueber erbungleiche Kreuzungen. Ber. Deutsch. Bot. Gesells. 

 ^^=435-443' 1900. 



