of (Eatmwttrut 



PUBLIC DOCUMENT No. 47 



State Geological and Natural 

 History Survey 



COMMISSIONERS 



MARCUS H. HOLCOMB, Governor of Connecticut (Chairman) 

 ARTHUR TWINING HADLEY, President of Yale University 

 WILLIAM ARNOLD SHANKLIN, President of Wesleyan University 

 FLAVEL SWEETEN LUTHER, President of Trinity College (Secretary) 

 CHARLES LEWIS BEACH, President of Connecticut Agricultural College 



SUPERINTENDENT 

 WILLIAM NORTH RICE 



BULLETIN No. 23 



HARTFORD 



Printed for the. State Geological and Natural History Survey 

 1915 



