. Life histories of North American diving birds : order Pygopodes . comes partly or wholly obscured by muddy, dirty, nest-stains and the egg is often plastered over with mud and bits of nestmaterial, giving it a dark mottled appearance. Much of this can be• washed off, but the stains seem to be indelible. The measurements of 60 eggs, in the United States NationalMuseum, average by millimeters; the eggs showing the fourextremes measure by , 49 by 33, and by 30 millimeters. Tovm,g.—^The period of incubation proved to be 22 or 23 days foreggs of this species which we hatch
. Life histories of North American diving birds : order Pygopodes . comes partly or wholly obscured by muddy, dirty, nest-stains and the egg is often plastered over with mud and bits of nestmaterial, giving it a dark mottled appearance. Much of this can be• washed off, but the stains seem to be indelible. The measurements of 60 eggs, in the United States NationalMuseum, average by millimeters; the eggs showing the fourextremes measure by , 49 by 33, and by 30 millimeters. Tovm,g.—^The period of incubation proved to be 22 or 23 days foreggs of this species which we hatched out in our incubators. The young are very precocious and can dive and swim instinctivelysoon after they have hatched. As soon as they are able to feed and toswim about they may be seen riding in safety on their mothers backas she swims about the lake, clinging to her plumage when she divesand coming to the surface with her, as if nothing had is said that the mother bird turns her head and feeds the young U. S. NATIONAL MUSEUM BULLETIN lOr PL. 5. Lake Winnipegosis, Manitoba. H. K. Job.
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