<>94 



KuPFER : Anatomy and I'uvsioiam.v 



due to the fiict tliat growing shoots (and therefore shoots very far 

 from the usual basal region of leaf-production) were used ; or 

 finallv, it mav 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 i)nn1or- 

 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, /. i\, 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 1 5 more or less healthy 

 young plants. '" 



On three of the cuttings which 

 were planted earliest, reversion 

 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 re- 

 duced almost to a minimum. Also (and this seems extraordinar)-) 

 the main shoot produced near its apex several smaller leaves. This 

 is the plant represented in /. //. 



On the second plant a .similar set of phenomena was ob.servable. 

 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. 



Fig. 1 1 . Cutting of Bacc/iaris genistc/- 

 loides, showing production of juvenile 

 aves. 



