(152 ) 
Tasie VII. 
PARTHENOCISSUS QUINQUEBFOLIA. CHANGE OF POSITION OF LEAFLETS. 
A B c D E 
oO ° o fe] oO o o o 
Normal Series. 70.5 #IY.51/ 129.7 .85]179.5 + .68)229.1-41.22 288. 3-1, 07 
Operated Series. 76.4 +7 1.21 | 141.9 + 1.17 | 203.9 + 1.08 285.I-41.31 
Differ ° ° ° ° 
Changec of Position. +59 + 12.2 + 244 — 8.2 
2P.E. M. Pe roe al :8 ey 
2 P. EK. M.=Sum of the Probable Errors of the Normal and Operated Series, 
the unbroken lines representing the average normal positions 
and the broken lines the average operated positions. 
interesting points are brought out by a study of this diagram. 
In the first place, the changes are evidently in some way con- 
T (One half natural size.) arthenocissus quinguefolia. 
normal — lines) and average operated (dotted lines) position and 
length of leafle 
Two 
Average 
nected with a closing up of the gap left after the removal 
If this were the only factor we would ex- 
pect the closing up to take place symmetrically from the two 
of leaflet D. 
sides. 
Thus we ought to get a large plus motion in C and B 
