694 KuprerR: ANATOMY AND PHYSIOLOGY 
due to the fact that growing shoots (and therefore shoots very far 
from the usual basal region of leaf-production) were used; or 
finally, it may have been due to the fact that all the shoots which 
were experimented with formed flower-buds on being released, as 
it is believed that when a shoot has once laid down the primor- 
dium of a flower it is thereafter unchangeable. 
To avoid the repetition of 
these conditions it was deter- 
mined to defer the experiments 
until such a time as separate 
plants would be available for the 
different experiments. For this 
purpose, but also more particu- 
larly to determine the effect upon 
the leaf-reversion, a large num- 
ber of cuttings were made, con- 
sisting, of course, of the youngest 
shoots, 7. ¢., those farthest from 
the juvenile character. The cut- 
tings were difficult to root ; less 
than half of those planted at 
three different times succeeded. 
At present, however, there are 
about 15 more or less healthy 
young plants. 
On three of the cuttings which 
Fic. Fi, Cutting of Baccharis genistel- were planted earliest, reversion 
ne en see shoots of a remarkable character 
developed. The first one to be 
affected produced from buds two branches, on each of which ap- 
peared three reversion leaves, and on which the wings were tT 
duced almost toa minimum. Also (and this seems extraordinary) 
the main shoot produced near its apex several smaller leaves. This 
is the plant represented in f. rr. 
On the second plant a similar set of phenomena was observable. 
Three shoots bearing some of the largest leaves that have been 
_ found and the greatly reduced wings appeared, and at the same 
time the tip of the shoot continued to produce leaves as it greW: 
