TWENTY-SECOND ANNUAL REPORT ey 
ATTENDANCE AT THE AQUARIUM BY MONTHS, 1917. 
January Visitors............. hS,949> Daily, average. = 2,546 
Webrwarye > keen 76,648 ‘S HY Ae Pe lat AU Cree Dalhes 
March Ne eee ee 98,790 ss Soe OC peice te eee 3,186 
JENTOVGTI 4 ee en 142,338 SN ihe queen ee 4,744 
May Sip eee ae 158,286 S Sale © ARW cesta Sve 5,106 
June a ene 186,938 . et D guk ace piaehee 6,231 
July Highs cothetes ts 196,252 Sei tf we pete tahoe. 6,330 
August rene (hee LeU PEN? es Sy pate, POST eee 7,103 
DEDLEMIDEr: wal eee. 177,369 * a See ee 5,912 
October i hae 120,462 ee ie Tae WE Batt a8 3,885 
November 9°  2aktu.. 88,570 a i erie ret 2,952 
December! 2s. 49,304 ‘ Aine eee 1,590 
A ocellige ys cy Met eek 1G OSes Sle fF clasts Rds 4,370 
Density Record.—The daily observations on the condition 
of the water of the Harbor, commenced at the Aquarium in 1903, 
have been continued practically without interruption. These 
unique records, published annually in our report, have been use- 
ful not only to the Aquarium, but of important public service 
on many occasions. 
Record of monthly mean temperatures and specific gravi- 
ties at the New York Aquarium during the year 1917 (from 
daily observations made by Mr. W. I. DeNyse).* 
Harbor Water—Temperature and Density. 
Temperature. Specific Gravity. 
ANNUITY ee st Me 42° 1.014 
Mebruany. 28 ve Be) 1.015 
MPa Chee We oh 39° 1-013 
J2\] 0 cill ER eal eee 43° 1.009 
I LPS 7 tS re een 48° TOA 
TING ys es Shae ides 1 OEL: 
UL ett tees AGM 63° RO 
PAUISUS Gee Ae 69° 1.013 
September 2... 4.2 68° LEO 
OctOberke ra. .s. es Ors OLS 
November ................ is Dow 1.013 
December 2.2525. eA 1.014 
“Density observations were made with samples of water brought to a tem- 
perature of 60° Fahr. 
