MERRILL] GLACIAL POTHOLE IO3 



form the task without the use of explosives, since these are certain 

 to shatter the rock to a greater or less extent. T|;ie damage might 

 be less to a rock of different structure, such as granite, but in the 

 present instance the disintegrating action of ice and water upon the 

 interior of the pothole for ages has necessarily left it in a brittle 

 condition. 



"Acknowledgments are due Mr. G. C. Campbell, owner of the 

 land on which the pothole was situated, for the gift of the stone and 

 for assistance rendered in every way possible to facilitate the work. 

 To Messrs. Liberty and Lake credit is given for their enterprise in 

 undertaking the work and for the ingenuity and skill displayed in 

 overcoming its difficulties." 



