32 ROOTS CAN GENERATE BUDS. 



stated, of the roots of such, trees possessing far more constitutional 

 vigotir ttan the branches. See his Physiological Papers, pp. 83, 325. 



The following is another instance of the kind : — On the banks of the 

 river Derwent stood a large Hawthorn hedge, which, being imdermined 

 by the water, fell in, and left the greater part of the roots in the bank, 

 about one or two feet below the surface ; the bank still wearing away 

 has exposed them to the air for the length of three feet or more, and 

 they are now in every respect similar to branches, developing buds, and 

 consequently aU the appendages of the axis ; they appear anatomically 

 the same as branches, excepting the pith, of which they are destitute. 

 Wow, it appears that roots when so circumstanced perform aU the 

 functions of the stem, confirming Knight's theory, that sap can at any 

 time generate buds, without any previously-formed rudiment, when 

 circumstances are favourable to their production. 



