8-165. 
LGR. 
16915 
studies of aquatic plants but most of the leaflet is devoted to 
an account of work with vredators in relation to nesting water- 
fowl. Control ss thus far carried on is regarded as part of the 
experimental work and the policy of doing the least necessary to 
optinum care of the protected birds is recommended. 
The status of migratory geme birds: 1939-40, Prepared in the 
Section of Distribution and Migration of Birds, Division of 
Jildlife Research. 22 pp., June 1940, 
annual report on abundance of the birds according to the fly- 
Ways anc migrations, with special sections on the January inven- 
tory, on crippling and other indirect losses, natural enemies, 
and upon the woodcock, mourning dove, cand 5 cther migratory species 
treated aS game. The ducks ard geese as a whole are believed to 
nave increased about 2-1/2-fold since 1935. “The mllard and 
pinteil show the largest gains, that for the canvasback is co 
Sidered satisfactory, but little change is detected in the sta 
of the redhead. A slight decrease is reeorded for the biack d 
Canada geese also made a gratifying gain, although much of this 
was lost through excessive shooting. During January 1940 adverse 
weather conditions in the Southeast, covpied with legal hunting, 
made serious inroads into the numbers of woodcocks énd mourning 
doves, with the result tmt the numerical strength of both species 
is mech below that of 1939. Measurcs to restrict the kill during 
3 
the fortrcoming scasen are definitely indicated. The continued 
status of the whitc-winged dove as a game spccics is opon to 
Serious question, not only because of improper managencnt in har- 
vesting tne crop but also of natural factors that cidangor the 
or 
stock, So far as can de determined, the status of the band- 
tailed pigeon and thc WJilson'’s snipe is satisfactory for the 
prescnt year, but both snccics must be watched to guard against 
undue depiction." 
Infectious myxomatosis of Gomoestic rabbits. (lio 
Big=head disease). By F. D.. MeKenney and E. L. Vail. 2 np., 
July 1940. (Supersedes Leaflet BS-89. ) 
Symptoms, transmission, and mortality of the disease; post- 
mortem appearances; control and prevention. 
Grups..in minks, . By J. .E. Shillinger. 2 pp., Se 
Larvae of a flesh fly that penetrate the skin and devour the 
flesh of young minks; treatment of wounds; screening out the 
flies is the best means of trevention. 
The digestibility of animal products and cereals »by minks. BY 
J. Ke Loosli,.S. Es Smith, and L. A. Maynard. 5 ov., 3 tables, 
September 1940, 
Report on 13 diets, with analyses of their nutritional contents 
and disestibility coefficients. 
Mink breeding--elementary principles. By Robert K. Enders. 4 p». 
P figs., August 1940, 
call tine 
