90 



SEA-SIDE PLANTS. 



considerable part of the original vegetation of this 

 world of ours. In modern days they are but a few 

 feet in height, but once they were tall plants many 

 yards high, or gigantic species more like trees 

 than herbaceous plants ; and the strata of the 

 coal-fields exhibit Equisetacege, beside which our 

 modern horsetails dwindle into insignificance. 



