334 
Mr. Knight’s Experiments on 
and their branches shot, during the whole spring, with equal 
luxuriance. But that part of the stems (of the trees whose bark 
had been taken off) which was below my incisions, scarcely 
grew at all; whilst all the parts above the incisions, increased 
as rapidly as in the trees whose bark remained in the natural 
state: the upper lips of the wounds also made considerable 
advances towards an union ; but the lower ones made scarcely 
any. 
Soon after Midsummer, those parts of the wood which had 
been deprived of bark became dry and lifeless, to some depth ; 
and the sap, in consequence, meeting obstruction in its ascent, 
some latent buds shot forth, in some of the plants, below the 
incisions When one of the shoots which these buds pro~ 
duced was suffered to remain, the part of the stem below it 
began immediately to increase in size ; but, if it was at any dis- 
tance below the incision above, the part between it and that 
incision still remained very nearly stationary, so as to be, in the 
autumn, almost a whole year’s growth less than the stem above 
the incisions. 
Choosing other stocks, which had each a strong lateral branch, 
I removed the bark, in the manner described, in two places ; the 
one above, and the other below, each lateral branch. The sap 
here passed both my incisions, as freely as in the former expe- 
riment; the lateral branches between them grew with the 
greatest vigour; and the part of the stem between those 
branches and the lower incisions increased much in size. I varied 
these experiments in every way that occurred to me ; and the 
result uniformly was, that those parts of the stems and branches 
which were above the incisions, and had a communication with 
the leaves, through the bark, increased rapidly ; whilst those 
