128 



NEW YORK ZOOLOGICAL SOCIETY 



May 



June 



July 



August 



September 



October 



November 



December 



Total 



230,469 

 312,993 

 303,726 

 261,513 

 225,432 

 163,702 

 106,439 

 93,120 



2,376,840 



7,434 

 10,433 

 9,798 

 8,436 

 7,515 

 5,281 

 3,548 

 3,003 



6,256 



RECORD OF MONTHLY MEAN TEMPERATURES AND SPECIFIC 



GRAVITIES OF THE WATER OF NEW YORK HARBOR 



AT THE BATTERY IN 1921. 



Temperature. Specific Gravity. 



Jamiary 44° 1.012 



February 42° 1.014 



March 42° 1.009 



April 49° 1.009 



May 51° 1.011 



June 63° 1.015 



July 67° 1.014 



August 70° 1.015 



September 70° 1.014 



October 64° 1.015 



November 56° 1.016 



December 51° 1.012 



From daily observations made at the New York Aquarium by Mr. A. H. 

 Clendeniug. Specific gravity observations made witli samples of water brought 

 to 60° Fahrenheit. 



Respectfully submitted, 



Charles Haskins Townsend, 



Director. 



