THE JSLANDS. 



205 



Analyses of Hydraulic Layers of Waterlime prom Sooth Point, Put-in-Bay, 



by Dr. H. Endemann. 



As is usually the case in the State of New York, the Waterlime group 

 on Put-in-Bay Island contains certain layers which make good hydraulic 

 cement. These are the flaggy layers which form No. 4 of the section 

 given on a preceding page. No satisfactory test has ever been made of 

 the quality of this stone, but some of the layers are known to possess 

 hydraulic properties. It is probable that, with some care in the selec- 

 tion of the material, good cement could be produced in any desired 

 quantity, and at little expense, at South Point. 



In my examination of the geology of the islands I have been greatly 

 aided by the cordial and efficient co-operation of my friend Capt. John 

 Brown, of Put-in-Bay, and I take this occasion to petum to him my sincere 

 thanks for numberless favors of various kinds. I also desire to acknowl- 

 edge my obligations to Mr. Norman Kelly and Mr. John W. Dunn, of 

 Kelly's Island ; to the first, for numerous fine specimens taken from his 

 extensive quarries ; to the second, for the intelligent appreciation and 

 preservation of the magnificent glacial furrows uncovered at the quarries 

 of G. W. Calkins & Co., and also for a series of photographs illustrating 

 them. 



