140 OF BUDS. 



liaritles to any that may have existed in the 

 parent plants. How propagation by seed is 

 accomphshed will be explained in a future 

 chapter, as well as the causes of some va- 

 rieties produced by that means. 



Mr. Knight, in the FhilosGphical Transac- 

 tions for 1805, has shown that buds origi- 

 nate from the alburnum, as might indeed be 

 expected. Tiie trunks and branches of trees, 

 and the knobs of genuine tuberous roots, like 

 the potatoe, are studded with them ; in which 

 respect, as Professor Willdenow judiciously 

 observes, Principles of Botany/, p. 15, such 

 roots essentially differ from bulbous ones, 

 which last are themselves simple buds, and 

 produce their shoots, as well as their offsets, 

 either from the centre or from the base. 



The contents of buds are different, even 

 in different species of the same genus, as 

 Willows. The buds of some produce leaves 

 only, others flowers ; while in other species 

 the same bud bears both leaves and iiowers. 

 Different causes, depending on the soil or 

 situation, seem in one case to generate leat- 

 buds, in another flower-buds. Thus the 

 Solandra grandijlora, Tr. of Linn. Soc, v. 6. 



