Missouri Botanicac Gardem 
GEORSE ENGELMAHM 
in order to make any advance in the argument, heed i 
to specify some particular in which the graft is affected 
by the stock — some quality which all will recognise. 
There is no distinction in Apples more generally and I 
easily understood than that of sweet and sour. If a 
pleasant Apple, grafted on a tree bearing sour fruit, 
becomes more acid, we may say the sour stock affects it. 
If when grafted on a sweet Apple tree it becomes less 
acid, we say again the sweet stock affects it. The 
Porter well illustrates this. I will now name several of 
many cases which might be adduced, where the evidence 
on this point is direct, positive, and unmistakable. And 
here let me remark that this evidence was not given to 
Botanical 
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