ON THE ORIGIN OF NEW SPECIES 
ter of the leaves the blackberry influence was 
unmistakably apparent. Strangely enough, 
the blackberry seeds which came from the 
cross produced the apple-tree growth. Four 
to five thousand trees were thus grown, all 
practically identical in character. All but two 
of the cross refused to fruit, though almost all 
of them blossomed abundantly. Some of the 
blossoms were rose-colored like the apple, 
some of them almost crimson. Nearly all 
were thornless. 
A black raspberry was crossed with a black- 
berry, with the result that most of the product 
of the union died just as fruit-bearing time 
came on. Many hybrids, Mr. Burbank notes, 
die when it comes to the age of reproduction 
because, for one or another reason, the stamina 
of the parents is exhausted and the act of 
fruit production proves too great a strain. 
The mountain ash and the blackberry were 
also crossed, resulting in a salmon-colored 
fruit, the bush bearing no thorns. Many com- 
binations of peaches and almonds have been 
made, further tests in this combination now 
being under way. In the proving grounds at 
Sebastopol there stands a row of these peach- 
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