162 BOTANICAL GAZETTE [FEBRUARY 
each other more in these experiments than the leaves with their 
centers cut out. 
Fic. 9.—Sister leaves: one cut into 4 pieces, other not subdivided, but all notches 
except one removed; from this notch a shoot is produced considerably larger than each 
of shoots produced from the 4 smaller pieces of other leaf; photographed 19 days after 
beginning of experiment 
The shoots produced by the whole leaves and by the leaves reduced in 
mass, therefore, were approximately in proportion with the masses of 
the two sets of leaves; or in other words, each set of sister leaves produced 
