( 160 ) 
tained because of a considerable plus movement of A and 
minus movement of &, the two combining to increase the in- 
terval ZA (see Tables VII and XI and f#. 6). 
When we take all the operated cases of Lupinus into con- 
sideration (Table XIII) the regulations concerned in the 
closing of interval CE are confused by the effect of the petiole 
position upon the intervals which come under its influence. 
As stated above (page 156) the leaflets show a marked ten- 
dency either to stop far short of the petiole or to swing con- 
siderably beyond it. A preliminary glance is sufficient to 
show the great influence this must have upon the value of an 
interval containing the petiole. The value of the interval 
FA in the 33 operated cases, in which the petiole remains 
there is 112.1° (Table XIV). Adding to these the 20 cases 
in which the petiole has moved away we get an average for 
the whole 53 cases of 99.4°, a clear decrease of 12.7° even in 
this mixed lot (Table XIII). If now we get the value of 
each interval, first in the cases in which it contains the petiole 
TABLE XV. 
LUPINUS ALBUS. DETERMINATION OF THE VALUE OF THE PETIOLE 
FacrTor. 
AB BC CE EA 
Cases not including 
; A No. of Cases. 45 52 42 20 
Petiole in Interval. Average of Intervals. | 70° | 74° | 104° | 75° 
Cases including 
: No. of Cases. 8 I II 33 
ees ae Average of Intervals. 99° | 114° | 145° | 112° 
Group B— Group A= : ; ; 
Petiole Patter. -+-29° | +40° | +.414° | +37° 
Average Value : 
of Petiole Factor. +37 
and then in the cases in which the petiole is elsewhere, the 
difference between the two values should, other things being 
equal, give us the influence of the petiole upon the interval. 
Such a scheme is given in Table XV, which gives first the 
values of the respective intervals when they do not contain 
the petiole and then the values with the petiole. The second 
