8 ENDOGENOUS TREES. 



there is new substance and solidity. The mode of 

 growth and the phenomena referred to are denoted 

 by this word "exogenous/' which is literally no 

 more than " expansion outwards," 



Very different are the mode of growth and the 

 internal condition of the trees called " endogenous." 

 These show no distinction of bark and wood and 

 pith; they are destitute of branches (except in a 

 few instances); and their leaves, which are incon- 

 ceivably immense to any one who has never seen 

 leaves larger than those of English trees, are pro- 

 duced only upon the summit of the stem. They are 

 chiefly represented in the illustrious tropical pro- 

 ductions known as palm-trees those soul-moving 

 emblems of the south and east, and in England are 

 only seen in large and costly conservatories, where 

 room can be afforded them to lift their green pride 

 on high. Even then we only see them as juveniles, 

 no possible structure of glass being competent to 

 shelter palms when full-grown, except in the case of 

 some of the dwarf kinds. 



It is among the exogenous trees, accordingly, 

 that in England we find our delight. It is these 

 which form the sweet and solitary arcades of the 

 forest ; that are the homes or the resting-places of 

 the birds; that shelter us from the storm, and 

 temper the heat of the sun ; whose trunks are em- 

 bossed with tender creepers of green moss, or hidden 

 by the activity of the innumerable and ubiquitous 



