160 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



productiveness of the tree to a marked extent as well as producing such 

 a large proportion of hybrids. 



We will present but one other example of this cross, namely, the 

 Camulos tree on the old Camulos or Del Valle ranch situated close 

 to Camulos station, in Ventura County, on the Southern Pacific Rail- 

 road. This tree stands in a grove of old English walnut seedlings, and 

 evidently resulted from a chance cross with wild black walnut pollen 

 on the original tree whose nuts were used for growing the trees for 

 this orchard. This is a very large, spreading tree, and is notable in 

 producing much larger crops of nuts than any other Paradox tree 

 which we have found. This tree, for some reason, either on account 

 of inherent productiveness or crossing with the English walnut trees 

 about it, seems to produce every year a very large crop of nuts. It is 

 rather doubtful whether crossing with the other trees does take place 

 extensively, as these seedlings are very uniform and typical second- 

 generation Paradox trees rather than showing any indication of cross- 

 ing. We had at one time great hopes of this stock as a root for the 

 English walnut, on account of the productiveness of the tree and the 

 fact that its seedlings are of a very uniform type. Unfortunately, 

 however, like all other Paradox trees which we have tried, its seedlings 

 have failed to justify this hope and do not impart any exceptional 

 vigor to English walnut trees grafted upon them. 



The Strong tree, on the ranch of Mrs. H. W. R. Strong, near Whit- 

 tier, is a notable example of this cross in the opposite direction, the 

 tree having been planted for a southern California black walnut. This 

 tree is thought to have been planted somewhere about thirty-five years 

 ago and was one of several supposed southern California black seed- 

 lings brought from Orange County. It closely resembles at first sight 

 the black walnut type, especially in the foliage, but at the same time 

 the leaf and particularly the bark show the English cross. The nut 

 is very similar to the southern California black walnut. The tree is 

 now of immense size, especially in the spread of branches, which extend 

 far out with the lower ones coming down and resting upon the ground. 

 The tree is comparatively a very light producer, but it is evident that 

 some years it is crossed quite freely by the neighboring English walnut 

 trees, and a large proportion of its seedlings have the appearance of 

 first cross Paradox trees. The original tree is apparently a Paradox 

 which partakes much more of the characteristics of the black walnut 

 (the female parent) than of those of the English. 



Paradox trees resulting from a cross of the English on the eastern 

 black walnut, Juglans nigra, are comparatively uncommon, or at any 

 rate there are few trees in the State which can be traced positively 

 to this parentage. On the old Pleasants ranch in Pleasants Vallev. 



