THE STUDY OF THE ROCKS 



In the plant world, many fossils in amazingly 

 good states of preservation have been found. Some 

 of the giant Club Mosses from the coal measures, 

 exhibit all the characteristic stem markings, leaf 

 scars and the like, so clearly that one might imagine 

 one examined a living specimen. Most of the plant 

 remains are beyond the reach of the amateur, but 

 many of them may be viewed in museums, in 

 different parts of the country and the microscopist, 

 whether he be a student of rocks or a lover of plants, 

 should make a point of examining them. From 

 quite fragmentary remains, scientists have been able 

 to conjecture what vegetation covered the earth at 

 various ages. The present is the age of flowering 

 plants, but long ago the world was green with giant 

 Club Mosses and Horsetails, very humble plants at 

 the present time. 



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