166 PHILOSOPHICAL NOTES ON 



nickname we seem to cheat ourselves into believing that it is 

 essentially different from its homologue. Some roots and buds we 

 call adventitious, and then we think we have made them different 

 from other roots and other buds, especially when we have settled 

 in our minds that the root proper is only that which develops 

 at one end of the caulicle of the embryo, and the bud proper that 

 which develops in the axilla of a leaf. 



The radicle of the seed-bud is no other than the same com- 

 mencement of a root, which we see in the leaf -buds of Bryophyllum 

 or Asplenium decussatum, shown in Fig. 42, or in the aerial roots 

 of orchids, which function only as organs of attachment. 



Fig. 42. Bud Id the axilla of pinna of Asplenium decussaium, with radicle 



at (a).- (Goebel, " Outl. of Classif.," Fig. 159.) * 



In the strawberry runner, a root-bud is given off from each 

 side of the leaf, or of the axillary bud, or of the node, as we might 

 choose to call that from which leaf, bud, and root or roots 

 emerge. 



In the germination of the lily-seed, according to Duchartre, 

 the radicle ^vithers, and in its stead, two side rootlets appear at 

 the base of the leaf. These are evidently the homologues of the 

 pair of rootlets which appear at the nodes of so many plants. 

 They are made different from the radicle only by being called 

 adventitious roots. 



