82 



Lancaster. Mr. Bixby and otliers have told you about liis having 

 made a number of very remarkable crosses. He first tried to apply 

 a native hazel pollen on the pistillate flowers of European filberts 

 with negative results^ the same as had been the experience on the 

 Pacific coast. Then he reversed the order and put Barcelona pollen 

 on the pistils of the Rush variety with success. Later he introduced 

 many other varieties. Those trees are remarkably vigorous, remark- 

 ably jDrolific. In this cluster there were 47 nuts. 



The Corylus colurna, Turkish hazel commonly called. This photo- 

 graph was taken in Oregon. There are several trees, probably the 

 oldest in the United States, in Highland Park, Rochester. 



On request of the chair that he report his progress in immunizing 

 chestnut trees against the chestnut blight, Dr. Zimmerman spoke as 

 follows : 



Dr. Zimmerman: I did not expect to make an address when I 

 came here, but inasmuch as some of our friends have been enquiring 

 about this matter I will make a brief statement and I want it under- 

 stood that what I am going to tell about is of a strictly experimental 

 nature. 



In the first place, I am fully convinced that these trees can be 

 immunized and will be immunized. 



In the second place, I have found it necessary to change my plan. 

 I believe that there is more or less incompatibility between the grafted 

 top and the root system, sufficient in some cases to kill the tree. With 

 that in mind I have determined to get my plants on their own roots. 

 I foresee the time when horticulturists at large will be getting their 

 plants and trees on their own roots, unless there is some specific 

 reason for not doing so. Naturally when T tried to get these trees on 

 their own roots I ran up against more obstacles. I have 

 several plans in mind. I believe it is possible to grow chestnuts 

 from cuttings, although I have never done it. I did go sufficiently 

 far so that if I could have liad proper conditions I think I could have 

 rooted them verv well. The thina; that makes me believe that is that 

 two years ago ground mice ate off the root system entirely under 

 two trees. When these trees drojjped over I noticed that callus was 



