18 University of California Puhlications in Apricultaral Sciences [Vol. 2 



abuonnal fi-uils, with their liusks dry and brown hut in most 

 eases uninjured, were pieked up by the writer beneath one of 

 the several trees upon which such fruits have been known to 

 mature. But most of these trees produced only a few such fruits. 

 Mature abnormal fruits are easily assorted into two or three lots 

 according' to their external markings. Very few differ notably 

 from the two classes illustrated in plate 9, figure 13. However, 

 in each class there are greater extremes of variation than are here 

 shown. The series a, h, c has been designated "Type X" and 

 the other series, "Type Y. " In a, h, c, d, e, the fruits appear as 

 when picked up ; a, h, c, are seen in longitudinal plane, while 

 d and e are seen from above; in a', h' , c' , d' , e' , the dry husk 

 has been entirely removed from the woody shell of the nut. These 

 nuts are from fruits which resemble a, h, c, d, and e so closely as 

 to be practically identical. While a' , c' , e' are seen from above, 

 h' and d' are shown in longitudinal plane. The nuts a", 6", c" , 

 d", e" are practically identical with a\ h', c' , d' and e'. They 

 were sectioned transversely and placed in relatively the same posi- 

 tions as a' , &', c' , d' and e' respectively, the basal portion of the 

 nut being placed in the upper of the two rows in each case. To 

 me. the most striking abnormality show-n in this picture is tlie 

 unequal reduction of the cotyledons in all except e". 



Two culture tests of abnormal nuts selected to these types 

 have been made in 1910 and 1911. There is considerable varia- 

 tion among the seedlings grown from each type, but no general 

 differentiating character could be found among all the seedlings 

 from the two types of nuts. These tests were subsidiary to the 

 general trials of abnormal nuts conducted during the same years 

 in order to ascertain whether the new form originates from such 

 nuts. Among sixty-eight seedlings growing not one has shown 

 the slightest indication of the leaf characters of the new form. 

 In 1910 trials one seedling appeared that had three-parted scale- 

 like leaves, but it died before it was three inches high. The leaves 

 did not resemble those of the new form. 



On otherwise normal Juglans calif or nica trees, abnormal 

 leaves have been observed in two situations — near the base of 

 second-growth lateral branchlets and, occasionally, associated with 

 the abnormal catkins already described. Abnormal leaves, from 



