194 CONSERVATIVE ORGANS. [LECT. V. 



Monkshood, Aconitum neomontanum (fig. ?/), af- 

 fords an excellent 

 example of the pro- 

 gressive conical 

 root; a. the old 

 root supporting b. 

 the lower portion 

 of the stem ; c. the 

 new root attached 

 by the lateral offset 

 d. to the basis of 

 the stem b. : so that 

 the new stem, which 

 should have arisen 

 from the bud e. 

 would have been 

 about one inch from 



the old plant, had it been left in the ground. The 

 moniliform roots (p. 142), also, are progressive ; as 

 those of Paeony, Pseonia officinalis, and night smell- 

 ing Geranium, Pelargonium triste ; but in these 

 the progression is made by suckers thrown up 

 from the nodules ; such roots in this respect re- 

 sembling the tubers on the pendulous tuberiferous 

 roots. The difference, however, between the 

 progressive roots and the tuberiferous, is very ob- 

 vious; the caudexes and nodules in the former 

 being real roots, furnished with lateral rootlets 

 issuing from their surface; whilst the tubers, in 



