618 Kny . — On Correlation of Roots and Shoots . 
The following are the numerical results of the measure' 
ments : — 
Series I. Uninjured cuttings: — 
Length of the longest root .... 
Total fresh weight of roots .... 
» dry .. „ .... 
Length of the longest shoot .... 
Total fresh weight of shoots .... 
„ dry „ „ .... 
Length of the longest leaf-segment 
Series II. Buds repeatedly removed : — 
Length of the longest root .... 
Total fresh weight of roots .... 
„ dry „ „ .... 
Series III. Roots repeatedly removed : — 
Length of the longest shoot .... 
Total fresh weight of shoots .... 
» dry „ „ .... 
Length of the longest leaf-segment 
276 mm. 
2026 gr. 
1-024 gr. 
408 mm. 
92* 1 gr. 
12*775 g r * 
129 mm. 
269 mm. 
9*55 gr. 
0-598 gr. 
321 mm. 
52*i gr. 
8-607 gr. 
no mm. 
(N.B. Only one leaf of Series III had a segment of this 
length. In all the others they were much shorter.) 
From what has been stated above, it follows that in cuttings 
of Ampelopsis quinquefolia , just as in those of Salix acuminata 
and S. purpurea, the continual removal of the young shoots 
was soon followed by a less vigorous development of roots, 
and vice versa . There is, however, this difference to be 
noted, that whereas in Salix the retarding influence is to 
be detected first in the roots, in Ampelopsis it is the shoots 
which in this case proved themselves more sensitive than 
the roots. 
