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THE POPULAR SCIENCE MONTHLY 



and around irregular cliffs, simply to find in a crack some ground for 

 anchorage (Fig. 3). 



From a technical standpoint also the cell structure of trees and 

 other plants must be considered as a wonderful manifestation of the 

 resources of nature. 3 



Fig. 2. 



In this respect, the stalk of a rye-plant may be mentioned as a 

 typical example. This plant meets the same requirements that are 

 "Sehwender, "Mechanische Problenie der Botanik," Leipzig, 1909. 



