112 



NEW YORK ZOOLOGICAL SOCIETY. 



month in the character of the water-supply and in showing the 

 endurance of different species of marine fishes and invertebrates 

 under conditions of changing density. 



The densities vary greatly, being affected by the floods of the 

 Hudson River, southerly gales which increase the amount of sea- 

 water in the Bay, and the ebb and flow of the tides, especially the 

 very high and low tides of spring and fall. 



RECORD OF MONTHLY MEAN TEMPERATURES AND SPECIFIC GRAV- 

 ITIES AT THE NEW YORK AQUARIUM DURING THE YEARS I903, 

 1904, AND 1905. 



(From daily observations made by Mr. W. I. DeNyse.) * 



1903. 



1904. 



1905. 



DR. MAYER S BOOK. 



This work, entitled " Sea-Shore Life," forms the first volume of 

 what has been named " The New York Aquarium Nature Series." 

 The manuscript and illustrations were presented to the Zoological 

 Society by the author, with the suggestion that it be published as 

 emanating from the New York Aquarium, and that the proceeds 

 from its sale be applied to the improvement of that institution. 



As this was in accord with the Society's plan to increase the 

 usefulness of the Aquarium by developing its educational and 

 scientific possibilities to some extent, the work was printed and 



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

 ture of 60° Fahr. 



