regions. Thus sticks 10-15 mm. thick and 60 cm. long were 

 cut across into three and four pieces and the pieces of each tied 

 in a bundle so that successive pieces of the same stick were alter- 

 nately inverted and not inverted. Larger sticks 30 mm. thick 

 and 90 cm. long were cut into pieces each 45 mm. long and 

 smaller sticks 8 mm. thick and 60 cm. long were cut into pieces 

 30 cm. long. In each case the successive pieces were tied to- 

 gether side by side, one inverted the other not. In all ca.ses the 

 bundles standing upright in water with the upper half in the air 

 showed within 48 hours roots growing in the water and leaves 

 growing in the air, on all the pieces of sticks. 



In those bundles of sticks cut across into two pieces the fol- 

 lowing combinations occurred, (ij The basal half-piece put out 

 roots from its basal and leaves from its apical part while the 

 apical half-piece put out leaves from its basal and roots from its 

 apical part. (2) The basal half-piece made leaves from its basal 

 and roots from its apical part while the apical half-piece made 

 roots from its basal and leaves from its apical part. (3) The 

 basal half-piece made leaves from its basal and roots from its 

 apical part while the apical half-piece made leaves from its basal 

 and roots from its apical part. In the first case the cut surfaces 

 that used to join at the middle of the stick were side by side in 

 the air ; in the second case they were side by side in the water ; 

 and in the third case they were separated so that one was in the 

 air and the other in the water. 



The same response to air and water was shown again in a twig 

 cut into basal, middle and apical pieces, which made roots from 

 the basal and leaves from the apical part of the basal piece, leaves 

 from the basal and roots from the apical part of the middle piece, 

 and roots from the basal and leaves from the apical part of the 

 apical piece. And when these three pieces were placed together 

 again there were seen along the length of the twig : first some 

 roots, a number of new side branches, another set of like branches, 

 a second set of roots, a third set of branches and finally a third 

 set of roots. 



Even more striking appeared the succession of new growths 

 upon a forked branch, when the pieces were restored to their nat- 



