(158) 
Changes in the Intervals between the Leaflets. 
From the average positions in Tables I to VI we are able to 
determine the average values of the intervals between the leaf- 
lets in the different cases. This enables us to get at the 
changes in the intervals as a result of the operation. As 
stated before, the changes in position seem to be aimed at a 
closing up of the large interval left by the removed leaflet. A 
study of the interval changes throws some further light on this 
point. #. 6,7, 8 and g show us these changes in diagram- 
matic form and should be referred to in the following discus- 
sion. The average values of the intervals in Parthenocissus 
as obtained from Tables I and II are shown in Table XI, in 
which each of the intervals is designated by the two leaflets 
TABLE XI. 
PARTHENOCISSUS QUINQUEFOLIA. CHANGE IN THE INTERVALS 
EEN THE LEAFLETS. 
AB BC CD4+DE=CE EA 
Normal Series 59.2°!} 49. 8° 49.6° ++- 59.2° = 108.89 |142.2° 
Operated Series. 65.5° | 62.0 81.2° 151.3° 
Diff. = Change in Interval. |+6.3° | +-12,2° —~-27.6° +9.1° 
which form its boundaries. We see that the interval CZ has 
been decreased by 27.6°, the decrease being accompanied 
by an increase in AB of 6.3°, in BC of 12.2° and in ZA 
of g.1°. 
Trifolium pratense. —Table XII gives us the values of 
the intervals as obtained from Tables III and IV. The re- 
TABLE XII. 
TRIFOLIUM PRATENSE, CHANGE IN THE INTERVALS BETWEEN 
THE LEAFLETS 
XY | ¥2Z4ZN = VX 
Normal Series. 92. a 93.0° + 174.7° = 267.7° 
Operated Series. 104.2 255°.8 
Diff. = Change in Interval. +11.9° | —11.9° 
sults show a decrease of 11.9° in the interval 2?<¥ and a like 
increase in YY. 
