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 visitors.... 111,835 Daily average 



Total 



1,850,575 



3,607 

 4,322 

 4,516 

 5,506 

 5,884 

 6,412 

 6,579 

 7,534 

 5,809 

 4,396 

 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 obsei'vations were made with samples of water brought 

 to a temperature of 60° Fahrenheit. 



