TWENTY-FIRST ANNUAL REPORT 129 
The working force rendered excellent service. As previously 
stated, four of the large exhibition tanks were built during the 
summer by our own men. Advantage was taken of the resigna- 
tion of one attendant and of Mr. Chapman Grant, to increase 
the compensation of all persons in the Aquarium receiving less 
than $1,000 per annum, these raises being deemed urgent on 
account of the increased cost of living. The vacant attendant’s 
position was not refilled, the other vacancy being refilled at a 
lower rate of compensation. 
The Director takes pleasure in calling attention to the 
cheerfulness and efficiency with which the employes have per- 
formed the duties assigned to them. 
Miss Mellen has lettered, numbered and card-catalogued the 
collection of Aquarium pamphlets and monographs, about 900 
in all, and has in preparation an index of the entire library, con- 
sisting of some 850 works, with special, separate indices for 
works in sets, such as the American Naturalist, 41 volumes; 
Reports of the Massachusetts Fish Commission, 1868-1910, etc. 
She has also indexed the collection of Aquarium photographs 
taken by Mr. Sanborn and others from time to time and con- 
sisting of about 950 prints arranged in 10 large, loose-leaf vol- 
umes. Each volume now bears a label and a special index, and 
there is, besides, a separate, general index, by means of which 
any picture desired in any one of the 10 volumes may be turned 
to immediately. 
AID TO SCHOOLS AND TEACHERS. 
During the year, small forms of marine life for stocking 
school aquaria were supplied to 36 schools and colleges in Great- 
er New York. Many teachers in the city schools bring their 
classes to the Aquarium once a year. In 1916, there were 235 
such classes accompanied by teachers, a total of 9,546. 
LABORATORY WORK. 
Dr. G. A. MacCallum continued his studies of the parasites 
of fishes and prepared a second paper on the subject which was 
published by the Zoological Society during the summer. 
Dr. Sergius Morgulis continued his investigations on nutri- 
tion in fishes, under the auspices of the U. S. Bureau of Fisheries. 
