iyi3] Babcock: New Form of Juglans 15 



Summary for 1911 

 Tree A 



Source of Number of pistillate Number of nuts Nuts germinated 



pollen catkins pollinated produced June 1, 1912 



Q. agrifolia 20 9 



Q. lobata 20 9 



Q. diimosa 12 4 2 



Checks 14 4 



Tree B 



Q. agrifolia 24 18 15 



Checks 13 10 7 



Trees B and C" 

 Q. lobata 44 29 22 



Results of Ui/hridization Experiments 



From the 1908 pollinations with Quercus agrifolia upon Jug- 

 lans calif ornica there are now 48 fonr-vear-old seedlings. Cions 

 from most of these have been grafted this spring npon large 

 English walnuts in order to hasten fruiting. It is planned to 

 protect these grafts at the blooming period so as to secure self- 

 fertilization and thus make possible the "breaking-up" which 

 may occur in the F, generation if they are really hybrids. 



From the 1910 experiments (made by Goodall) there are eight 

 seedlings from the Q. agrifolia pollinations and four from Q. 

 lohata pollinations. Grafts may be made from these next year. 



From the 1911 experiments there are 14 seedlings from the 

 Q. agrifolia pollinations, 20 from the Q. lohata, and 2 from the 

 Q. dumosa crosses. 



The seedlings obtained from all oak pollinations resemble J. 

 calif ornica in leaf characters and habit of growth. This does not 

 necessarily mean that these seedlings are not true hybrids. It 

 has been demonstrated that certain species-hybrids are goneoclinic 

 to the female parent in the F^ generation.^ It is in the hope of 

 showing that these seedlings are hybrids by the appearance of 

 oak characters in plants of the F^ generation that the seedlings 

 are being propagated to secure early fruiting." 



"' While ill storage the Q. lobata nuts from Trees B and C became 

 mixed, but 24 of the 29 came from Tree C. 



sKeeble, F., The Gardener's Chronicle, vol. 52, no. 1355, p.. 457. 



Since writing the above it has been found that most of the seedlings 

 from the 1908 crosses bloomed this spring (1913). Hence it was possible 

 to secure self-pollination on the seedlings themselves at an earlier date 

 than was anticipated. 



