TWENTY-FIRST ANNUAL REPORT 131 



P'or many years daily observations have been made at the 

 Aquarium on the temperature and salinity of the water of the 

 Harbor as pumped into the larjre floor pools of the building. These 

 are the only records of the kind kept in the City, and have 

 been frequently consulted by City officials. Their publication in 

 the Annual Report keeps them in convenient form for refer- 

 ence at the Aquarium and more available for general use. 



Record of monthly mean temperatures and specific gravi- 

 ties of the water of New York Harbor at the Battery, during 

 the year 1916. 



{From daily obserrationi^ made by Mi: W. I. DeNy^e"^'.) 



Temperature Specific 



Months of water Gravity 



January 41 1,012 



February 42 1,012 



March 38 1,013 



April 41 1.009 



May 50 1,011 



June 57 1,012 



July 64 1,013 



August 69 1,014 



September 69 1,015 



October 63 1,016 



November 56 1,016 



December 49 1,013 



Respectfully submitted, 



Chas. Haskins Townsend, 

 Director. 



*Density observations were made with samples of water brought to a tempera- 

 ture of 60 degrees Fahr. 



