280 Kny. — Correlation in Growth . 
repeated digging up and replanting, no flagging of the shoots 
took place until they had attained a maximum length of 
465 mm. 
In the cuttings of Salix , the effects upon the shoots of 
removing the roots, and upon the roots of removing the 
shoots, made themselves apparent relatively early. The first 
thing to be noticed was a diminution in the development of 
the roots of those cuttings whose shoots had been removed : 
and then, somewhat later, the diminished development of the 
shoots of those cuttings whose roots had been removed 
became apparent. By analogy with the seedlings, just the 
opposite result might have been anticipated ; for in the 
seedlings it was the roots which asserted their independence 
of the shoots the longer. 
It remains to determine by more extended investigation 
to what extent the principles of correlation manifested in the 
growth of these few species are of general applicability. 
