NOTED CENTRES OF PRODUCTION 



13 



FIG. 9. A large laying Rock, Petaluma, Cal., wi 



laying houses. 



FIG. 10. A large breeding flock at a commercial hatchery. Petaluma, Cal. 



Photos by courtesy of The Petaluma Board of Trade. 



FIG. 11. Interior of a commercial hatchery, Petaluma, Cal. 



