(174) 
The changes of position were principally confined to the 
two leaflets left in an asymmetrical position with respect to 
the petiole as a result of the operation and were apparently 
directed toward the closing up of the enlarged interval left 
by the removed leaflet. In Lufznus albus, in a large num- 
ber of cases, a considerable plus or minus rotation of the 
whole leaf-system was induced which cannot be explained 
according to the above reactions. In these rotations one or 
more of the leaflets were carried across the surface of the 
petiole. 
A consideration of the values of the intervals in the 
operated series as compared with the normal series gave the 
manner in which the closing up of the enlarged interval was 
accompanied by increase in the other intervals. It was 
found that in Lupznus albus the main increase was confined 
to the asymmetrical intervals and was nearly equally dis- 
tributed between them. In Parthenocissus quinguefolia a 
slight plus movement of the leaflet at the left of the basal 
interval and a minus movement of the one at the right pre- 
vented a similar result. From the extensive and varied 
rotations of Lupinus albus it was possible to calculate the 
effect of the petiole upon the value of an interval. The 
average value of this petiole factor was found to be 4+ 37°. 
A consideration of the length of the leaflets in the operated 
series as compared with the normal series showed that there 
was a very uniform decrease in size of the remaining leaflets 
as a result of the removal. The average decrease for the 
three species amounted to 6.8 per cent. of the normal length. 
In the case of Lupcnus albus a study of the correlation 
between length of leaflets and their position in the leaf-sys- 
tem brought out the fact that a change from a more basal to 
a more terminal position was accompanied by a relative 
increase in length as compared with the cases in which the 
opposite rotation took place. 
