140 
NEW YORK ZOOLOGICAL SOCIETY 
STEAM-DRIVEN AIR COMPRESSOR FOR THE AERATION OF 
TANKS ON SHIPBOARD 
Attendance.—The attendance for 1919 was 1,850,575, an in- 
crease of 399,866 as compared with that of the previous year. 
These figures indicate that the falling off in attendance which oc- 
curred during the war is probably at an end. The daily average 
for the year was 5,070. 
ATTENDANCE AT THE AQUARIUM BY MONTHS, 1919. 
January 
February 
March 
April 
May 
June 
July 
August 
September 
October 
November 
December 
Total 
VISItOrs.... 
sé 
111,835 
121,108 
139,985 
165,185 
182,406 
192,387 
205,976 
233,554 
174,288 
136,291 
118,864 
70,697 
Press S50 a5 
Daily average.... 
6é 6é 
3,607 
4,322 
4,516 
5,506 
5,884 
6,412 
6,579 
7,534 
5,809 
4,596 
3,962 
2,280 
5,070 
Record of monthly mean temperatures and specific gravities 
at the New York Aquarium during the year 1919 (from daily 
observations made by Mr. W. I. DeNyse) :* 
*Specific gravity observations were made with samples of water brought 
to a temperature of 60° Fahrenheit. 
