Speciation Without Isolation

Author Institution: 3 Davie Circle, Chapel Hill, N. C

Propagation of Aquatic Game Birds

The propagation of aquatic game birds in the United States is a small but growing industry. Approximately 50,000 wild ducks and 5,000 wild geese constitute the present annual production. Some of these birds are bred by individual or organized sportsmen for their own use, some by fanciers because of their interest in the birds, and others by breeders for sale. The market for two species, the mallard duck and the Canada goose, demands birds for use in restocking, for decoys, and for food. Sale for food is the exception rather than the rule, and is to the better class of restaurants, hotels, and clubs, so that good prices are realized. Species other than the mallard and the Canada goose are produced only in small numbers and are sold to propagators and collectors of ornamental birds and to zoological gardens. The demand for all the species exceeds the supply, and for all but the two commonly bred kinds is sure to absorb all that are likely to be produced for a long time to come. This bulletin, together with Farmers\u27 Bulletin 1613, Propagation of Upland Game Birds, supersedes Farmers\u27 Bulletin 1521, Propagation of Game Birds

The Mechanism of Heredity in Relation to the Theory of Natural Selection

Author Institution: Fish and Wildlife Service, Chicago, Illinoi

Fluctuations in Organic Populations in Relation to Survival of the Fittest

Author Institution: 3 Davie Circle, Chapel Hill, N. C