14 University of California Publications in Agricultural Sciences [ Vol. 2 



the pistillate tiowers when i)ollinatinp: them. TIk^ only other 

 source of pollen in 11)08 was Disher's orijiinal sterile tree, which 

 is referred to below as Freak S. In the following' table "checlvs" 

 are bags tliat were left in place at time of pollination and allowed 

 to remain for several weeks, in order to learn wliether nuts would 

 develop. The trees referred to as growino: in 1913 are located 

 on the campus of the University of California. 



In 1909, the walnuts were very late in blooming and conditions 

 were so adverse that no nuts whatever were produced as a result 

 of pollinating thirty-four different catkins (about sixty flowers). 



In 1910 conditions were favorable and very promising. In 

 May, 1910, there were 151 nuts developing a^ a result of pollin- 

 ating 79 pistillate catkins with Quercus agrifolia pollen, and 29 

 nuts as a result of pollinating 16 pistillate catkins with Q. engel- 

 manni pollen. But through a miscalculation on the part of an 

 assistant regarding the proper time to secure the nuts before they 

 dropped from the trees, the entire lot was lost. However, this 

 assistant, S. E. Goodall made similar experiments at his home 

 near Chatsworth, using pollen from Q. agrifolia and Q. lobaia. 

 The oak-pollinated nuts were protected and saved, and as a 

 result there are growing on the campus of the University of Cali- 

 fornia eight young trees from Q. agrifolia pollinations and four 

 from Q. lobata pollinations. 



Experiments in 1911 



The trees used are located on F. Goodall 's ranch near Owens- 

 mouth, Los Angeles County. Three different trees were used. 

 They will be designated by the letters A, B, and C. Coffee bags, 

 having the outer layer of oiled paper, were used to cover pistillate 

 flowers. An effort was also made to secure reciprocal hybrids. 

 One tree of Quercus lohata was found which was shedding but 

 little pollen and which was somewhat removed from others of its 

 kind. Bags were placed over seven shoots of the season's growth, 

 thus covering forty to fifty pistillate flowers, after flrst having 

 pollinated them with J. californica pollen. Three weeks later 

 the bags were removed and some flowers seemed likely to develop 

 further, although some were moldy. On July 21 all had dropped. 



