1914] Babcock: New Variety of Juglans^ 51 



obvious that there is no rehition between degree of abnormality 

 of the nut and the appearance of the quercina form. However, 

 the fact that quercina seedlings have been secured from terato- 

 logical fruits might seem to indicate that in this fact of tera- 

 tology one finds the basis for a complete solution of the problem 

 in hand. But these are the first quercina seedlings I have raised 

 from abnormal nuts, and of the twenty-eight seedlings secured 

 only eleven are quercina in character. On the other hand, all 

 the young quercina seedlings examined in the past have sprung 

 from apparently normal nuts. This shows that something more 

 than the mere fact of teratology must be found to explain the 

 origin of the new variety. 



Regarding the third hypothesis the evidence now at hand is 

 definite and sufficient. Over three hundred clusters of normal 

 nuts were gathered separately from tree No. 16 in 1913, fol- 

 lowing the method described above. The number of nuts per 

 cluster varied from one to five. The nuts of each cluster were 

 stratified in a pot bearing the same label as the twig from which 

 the cluster came. Later the pots were transferred to a cool green- 

 house where they were kept until the plants were several inches 

 high. One quercina seedling was found in each of 42 pots. Plate 

 16, figure 4, shows the seedlings from the two nuts in cluster 35 ; 

 plate 17, figure 5, shows the seedlings from cluster 97 ; and plate 

 18, figure 6, the seedlings from cluster 196. Besides the 600 

 seedlings grown from marked clusters of nuts, about 1000 addi- 

 tional seedlings were raised from this tree. Of the total num- 

 ber of seedlings grown approximately 5 per cent were quercina. 



The fact that among the normal fruits of this particular tree 

 only one nut in a cluster produces the quercina form, at once 

 suggests a possible relation between location in the cluster and 

 production of quercina seedlings. Observations and experiments 

 are being conducted in order to determine whether there is any 

 definite position in the cluster or other morphological feature 

 that is associated with origin of the new form. 



The nuts gathered from this tree in 1913 may not have been 

 self-pollinated. About four hundred branchlets including 

 staminate and pistillate flowers were bagged in early spring, but 

 the warm moist weather mentioned above caused all the pistillate 



