BOTANY FOR YOUNG PEOPLE. 145 



L. What do the names mean ? 



E. Endogenous means, literally, an inside 

 grower ; exogenous an outside grower. Endo- 

 genous plants are also Monocotyledonous : ex- 

 ogenous plants, Dicotyledonous. 



The Cocoa-nuts, Date Palm, Sugar Cane, 

 and most of the trees of tropical climates are 

 endogenous. They have long stems of the 

 same thickness from top to bottom, the leaves in 

 the form of a Cabbage, being situated at the 

 top. The woody matter is deposited in the 

 stems in the centre at first, and as it is con ti mi- 

 ally forming, pushes out the old matter to the 

 circumference, and does this until the bundles of 

 wood at the outside become so closely wedged 

 together and tight, that it is impossible to in- 

 crease its diameter. Another layer is then 

 added upwards. Such trees have no real bark, 

 the rough appearance of the outside being merely 

 the remains of leaves. 



L. The trunks of such trees then, while grow- 

 ing, look like stumps of our trees when cut down 

 and sawed smooth, only covered on the top with 

 leaves. There are few of these curious plants 

 with us. 



E. None that attain the size of trees. You 

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