1&2 ILLINOIS STATE ACADEMY OF SCIENCE 



growth in 4 specimens. The rate of development here 

 was about the same as in leaf 3 where both leaves were 

 left on the stem. 



In following Loeb's experiments to show that root 

 pressure and not the roots themselves inhibited the notch 

 growth, few, if any, roots developed in B. crenatum. In 

 10 days shoots from the opposite buds developed in 2 

 specimens. In 12 days, there were shoots from both buds 

 in 4 cases. After 17 days, only one stem had formed 

 roots. There was no notch growth in the mature plants, 

 but in 14 days most of the leaves from very young plants 

 had some notch growth. That is, with B. crenatum, the 

 leaves with a piece of stem attached when placed in a 

 Petri dish with a small amount of water behaved similar 

 to leaf 2. 



In the seventh experiment, the stem of B. crenatum, 

 consisting of several nodes stripped of all its leaves, was 

 suspended in moist air, number 23. In 3 days apical 

 node buds had appeared from 2 out of 5 specimens. In 

 12 days, 2 shoots had developed at each apical node and 

 in two specimens, from the second node also. After 20 

 days, 2 shoots had appeared from the third node of 1 

 stem. Although the shoots of the apical node developed 

 most rapidly their development did not inhibit the growth 

 of the shoots at the lower nodes. This is shown in Plare 

 VI. The photograph was taken after 4 weeks. 



This plate also shows a single node, number 28, from 

 which the leaves were removed. When single nodes from 

 near the top of the main stem were used, buds appeared 

 on all the specimens in 3 days. In 12 days, 2 shoots were 

 growing from each node. This shows that in B. crenatum 

 the development in the single apical node was as rapid, 

 in some cases more rapid, than when, as in leaf 2, a leaf 

 was left on the stem. The presence of the leaf did not 

 accelerate the growth of the axillary bud. 



In experiment VIII, lateral incisions were made 

 through the mid-vein of leaves of B. crenatum. In 7 days 

 the smallest isolated leaf, leaf 38, showed notch growth. 

 3 of the 5 specimens of a leaf with a portion of the stem, 

 leaf 39, had developed both axillary buds, and the adja- 

 cent bud of the other 2 just showed. In 9 days, there was 



