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UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



tall, erect-growing tree, having somewhat smaller leaves and nuts and 

 smoother bark than the eastern species, with nuts the surface of which 

 is almost perfectly smooth. This type is popularly supposed to be 

 native to, and commonly distributed in, the northern half of the State. 

 Inquiry soon develops, however, that the majority of these trees have 

 been planted where they now stand within the memory of people still 

 living. 



FIG. 4. Northern California black walnuts, south of Gilroy. 



In this way, the history of numerous very fine, large, old trees can 

 be ascertained, the oldest of which are invariably found to have been 

 planted between 1850 and 1860. Such, for instance, are the two very 

 large trees standing by the roadside just south of Gilroy, and numer- 

 ous specimens about San Jose, Hayward, Stockton, Vacaville, Win- 

 ters, Suisun, Santa Rosa, Napa, Colusa, Marysville, Yuba City, Chico, 

 Tehama, and many of the old mining and commercial towns of the 



