TWENTIETH ANNUAL REPORT 121 



maintaining small aquaria in their class rooms. The living 

 forms supplied are chiefly small invertebrates, obtained from 

 the adjacent coast by the Aquarium's collector. 



When specially requested, a man from the Aquarium assists 

 teachers in establishing their aquaria. The subject of natural 

 history is made more interesting by the use of aquaria, and 

 many teachers avail themselves of the specimens ofl'ered. 



Since the year 1903 there have been daily records kept at 

 the Aquarium on the temperature and salinity of the water of 

 New York Harbor. These records are unique for New York 

 City and have been useful not only at the Aquarium but proved 

 very valuable to Metropolitan Sewerage Commission during the 

 investigations of the past few years. The records have been 

 published from time to time in the reports of the Director of the 

 Aquarium and are herewith presented for later years. 



Record of monthly mean temperatures and specific gravities 

 at the New York Aquarium during the period from 1912 to 

 1915, inclusive. 



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



191:3 1913 1914 191.5 



Temp. Spec. Temp. Spec. Temp. Spec. Temp. Spec. 

 Water Gravity Water Gravity Water Gravitv Water Gravity 



During the year 914 specimens were purchased by the New 

 York Zoological Society as follows : 



Four Blue Angelfishes, 15 Black Angelfishes, 5 Rock Hinds, 3 Red Hinds, 

 7 Shark Suckers, 3 Filefishes, '25 Spiny Lobsters, 42 Eels, I Sheepshead, 29 Pork- 

 fishes, 3 Red Groupers, 3 Spotted Morays, 5 Green Morays, 3 Cowfishes, 9 Gray 

 Snappers, 26 Stone Crabs, 2 Jolthead "Porgies, 3 Little-head Porgies, 9 Grass 

 Porgies, 17 White Grunts, 14 Spot Snappers, 15 Red Hogfishes, 3 Gags, 3 Black 

 Groupers, 4 Dog Snappers, 11 Common Triggerfishes, 9 Margates, 5 Pompano, 11 

 Chubbs, 7 Bream, 6 Yellowtails, 4 Spadefishes, 5 Jacks, 3 Blue-striped Grunts, 

 7 Schoolmasters, 6 Muttonfishes, 1 Nassau Grouper, 11 Squirrelfishes, 1 Doctor- 

 fish, I Moray (Li/codontis), 5 Scamp, 6 Red Groupers, 6 Gray Grunts. 3 Sea 



^Density observations were made with samjiles of watei- brought ti 

 l)erature of 60 degrees Fahr. 



