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The Ohio Journal of Science [Vol. XIX, No. 1, 



factor in retarding re vegetation, that such places will be the 

 last to be occupied by plants, whereas one would wish to place 

 stations in the places that will be first taken up by new plants, 

 if he could describe locations therein. 



The problem of marking the stations so that they may be 

 found again is also one of considerable difficulty. If one 

 intended to follow the progress of returning vegetation only for 

 a year or two, the customary wooden stakes would serve very 



Photograph by D. B. Church 

 THE SUMMIT OF PILLAR MOUNTAIN. 

 Vegetation Station 17. 



well. But where one wishes to follow the succession of vegeta- 

 tion, as in the present case, the stations should be so marked 

 that they can be visited a hundred years hence, and this is a 

 much more difficult matter. It was planned in advance to 

 mark the stations with iron pins, but when it was observed that 

 the natives have a habit of gathering up any pieces of old iron 

 that might prove useful, such marks were seen to be even less 

 permanent than wooden stakes. In no case where the stations 

 are located beside a fence, abandoned house, or other human 

 improvement, will the marker last for any such period. It has 



