(153) 
and a correspondingly large minus motion in # and A. In- 
stead of this we find practically all the changes in C and B. 
£ shows only a very slight minus motion while A shows a 
slight plus motion. This brings us to the second point: 
the change of position ts almost entirely confined to the leaf- 
lets which are left in an unsymmetrical position with respect 
to the petiole axis and the change in thems directed toward 
the production of a four-leaved symmetrical figure. 
Trifolium pratense. — The changes here are obtained by 
a comparison of the averages in Tables III and IV. e find 
(Table VIII) a motion of + 28.7° in leaflet 7 as a result of 
the operation and a motion of + 16.8° in leaflet X. As be- 
TasLe VIII. 
TRIFOLIUM PRATENSE. CHANGE OF POSITION OF LEAFLETS. 
x Y Zz 
o o ° fo} ° ° 
Normal Series. 79.4 + 3.09 I7l.7 42.35 | 264.7 + 2.34 
Operated Series. 96.2 + 2.00 | 200.4 = 2.20 
Difference — Change of . ° 
Position. ae eet 
o ° 
=P. E. M. +£5.09 £4.55 
(X1%-) Trifolium pratense. Average normal (unbroken lines) 
and average operated (dotted lines) position and length of leaflets. 
