TWENTY-FIRST ANNUAL REPORT 131 
For 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 large 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 observations made by Mr. W. I. DeNyse*.) 
Temperature Specific 
Months of water Gravity 
SAT WAT ee eo ee eel bs Al 1,012 
Me lictiays) 2 be chee 42, 1 OUZ 
Mitac liaise SO ee 8 Ste ee 38 1,013 
JN 0) il Ena ese ete a ee a 41 1,009 
Vey atin ees eae fee ee Gee 50 OL 
“Tre Gre dees ee ee aoe a ill WOLZ 
JU ie cater eusceizar Ra ome 64 1,013 
PND Sa{B ISTE Re oa, NE ea on eae ee 69 1,014 
September. .2.0 teres. 69 1,015 
October see seh ek a 63 1,016 
INowmemiberitertee ie s42 27. 56 1,016 
December i.e ese hn a 49 HOLS 
Respectfully submitted, 
CHAS. HASKINS TOWNSEND, 
Director. 
*Density observations were made with samples of water brought to a tempera- 
ture of 60 degrees Fahr. 
