Is it entirely due to individual taste, or may it be a difference in the food habits of these birds in different parts of the country that their flesh is highly esteemed in some regions but will scarcely be eaten at all in others? If it is true that the Michigan individuals eat snails, crabs, and mollusks rather than fish, and are therefore excellent for the table, while the California ones prefer fish and are therefore not fit for food, why have we not here a clear case of tendency to differentiation which will ultimately result in a good sub-species? The nesting of the hooded merganser is even more erratic than its occurrence. It has been found nesting in Florida as well as in the more northern parts of the country, and here and there throughout its whole range, being apparently absent from many regions during the nesting season. It is unlike the other "fish ducks" in preferring still water and secluded streams, but resembles the wood duck in building its nest a short distance from the water in a hollow tree or stump or on the flat side of a leaning or fallen tree, often forty or more feet from the ground. The nest consists of weeds, leaves, and grasses with a soft lining of feathers and down. This warm nest must be intended to act as an aid to incubation rather than as a warm place for the young ducks, since they, like other ducks, are carried to the water in the beak of the mother-bird shortly after they are hatched. The nest complement ranges from six to eighteen eggs, the average being about ten. The eggs are variously described by different authors, both as regards color and size, from pure white, pearly white, creamy white, buffy white to buff-colored, and from 1.75 × 1.35, to 2.25 × 1.75 inches. The average size is probably nearly 2.10 × 1.72. The downy ducklings are brown in color and, as they skim over the water, their pink feet churning up a spray behind, they present a bewitching picture. The male bird, like other ducks, assumes no share of the labors of incubation, but entertains himself hunting fish in some solitary stream where food is plentiful, and in proper season returns to assume the duties of the head of his lusty family. The nesting season must necessarily vary greatly with locality. In Minnesota fresh eggs are found during the third week of April, according to Dr. P. L. Hatch. The date would probably be much earlier with the Florida birds. The locality selected for the nest is also variable with the different parts of the country.