(139) 
were measured on the same day. The petiole of each leaf was 
cut off near the main stem of the plant and the leaf-systems 
were plotted according to the method indicated inf 4 and 5, 
which represent sample pages from my note-book. F-. 4 
shows ten normal leaves of Parthenoctssus and /. 5 ten 
operated leaves of the same species. The first leaf indicated 
on each page was placed upon the paper and its center was 
held down with one finger. The petiole was indicated by a 
L 
yg U 
i X 
a. ¥ 
e half natural size.) Parthenocissus quinguefolia. Ten 
leaves of ae series as plotted on page of note-book. 
line running from this center. The ends of the leaflets were 
then shown as dots, all numbered I, the different leaflets being 
designated by their particular letters A, B, C, D and £ or 
#, Yand Z. The second leaf was then taken and placed 
so that its center and the line of its petiole corresponded with 
the center and petiole of the first. The ends of the leaflets 
were indicated by dots as before, but numbered II in this 
case. The remaining leaves on each page were plotted in a 
