Explanation of Plate XIIT. 



'■ Cuts '''' aiui lioles sometimes with callus lormation. There is a marked 

 tendency for the cuts to be formed in the groove above the bud. In many- 

 cases there is an upward continuation of the bud, above the cut, and this 

 continuation is closely adpressed to the groove and fused to it for some distance 

 (c/. figs. 2, 7 and 8). Callus is being formed in figs. 1 and 6 above the cut, and, in 

 figs. 2 and 5, above a borer hole. In the latter case, an adventitious bud with 

 roots is developing. 



Fig. 9 shows the occurrence of cuts, in a simple form, on the stem of 

 Sacciuxrurn spontaneum. 



Figs. 10-1-5 exhibit the tendency for holes to be formed in the growth ring, 

 and fig. 15 shows that this is specially common on the outer sides of curved 

 canes. 



