PROGRESS IN BIOLOGICAL INQUIRIES, 1939 a 
vided for hatcheries there has developed, in different parts of the 
country, a diversified cooperative program of assistance. Studies 
of hatchery disinfectants, methods of disease control, methods of 
fertilization, selective breeding, hatching, rearing, and planting, as 
well as feeding experiments and nutrition studies have been under- 
taken. The popularity of the processed publication, The Progressive 
Fish-Culturist, sponsored and edited by the Division, has continued 
to grow and it has become the principal means of disseminating 
practical and scientific information related to fish culture and fish 
management in fresh waters. 
The studies of interior waters in relation to their value as angling 
resources constitute yet another phase of the Division’s work. Unlike 
the commercial fishery investigations which were faced with critical 
conditions at the outset, the opportunity is afforded to assess many 
of the angling resources while they are in a healthy state. The 
accumulation of information related to the management. of angling 
resources, stream improvement, and the formulation of stocking poh- 
cies has progressed as rapidly as the limited funds and investigative 
personnel will permit. The related studies of the effects of pollu- 
tion of all kinds have been advanced significantly both through 
controlled laboratory experimentation and ever-widening field inves- 
tigations. A comprehensive study of the effects of larvicides and in- 
secticides on fish populations has yielded important conclusions. 
COOPERATION 
The scope of the investigational activities of the Bureau has be- 
come so broad and diversified, as indicated by the preceding general 
discussion and the detailed reports which follow, that neither the 
appropriations nor the staff are adequate to carry on the work un- 
aided. The cordial relations with many colleges and universities and 
their generous provision of laboratory space, equipment, and other 
facilities have enhanced the work of the Division. for many years. 
The material cooperation of a number of States, various State 
agencies, and of many establishments of the Federal Government has 
continued in greater measure than ever before. The U. S. Forest 
Service, the Bureau of Reclamation, the War Department, the Coast 
Guard, ‘and the Tennessee Valley Authority have been concerned in 
cooperative undertakings during the past year. The Council of 
State Governments has continued to provide active assistance to 
the Bureau and to various States in the promotion of interstate and 
international cooperation in the development of means and measures 
for the preservation of the Atlantic coast and Great Lakes fisheries. 
The North American Council on Fishery Investigations, composed 
of representatives of the United States, Canada, Newfoundland, and 
France, held no meetings during the year because of the war in 
Europe. The organization remains active, however, and regular 
meetings will be resumed as soon as conditions permit. 
PUBLICATIONS 
Although substantial progress has been made in all of the Divi- 
sion’s many fields of investigation, and a number of manuscripts 
were completed during the year, the available funds for printing 
