. Birds . Egg of the Reed Bunting. Egg of the Ptarmigan. Egg of the Black Tern. from their varying so much ; the colourings and mark-ings differing greatly in the same species^ and even in the COLOUR OF EGGS. 41 same nest. Those of one colour retain it, with onlyshades of variation; but blotches or spots are often verydissimilar, occasioned sometimes, perhaps, by the age ofthe bird. It should, however, be added, that though themarks are so variable, thte shadings and spottings of onespecies never wander so as to become exactly figuredlike those of another family, but preserve a certain kindof
. Birds . Egg of the Reed Bunting. Egg of the Ptarmigan. Egg of the Black Tern. from their varying so much ; the colourings and mark-ings differing greatly in the same species^ and even in the COLOUR OF EGGS. 41 same nest. Those of one colour retain it, with onlyshades of variation; but blotches or spots are often verydissimilar, occasioned sometimes, perhaps, by the age ofthe bird. It should, however, be added, that though themarks are so variable, thte shadings and spottings of onespecies never wander so as to become exactly figuredlike those of another family, but preserve a certain kindof figuring from year to year. The eggs of the house-sparrow are the most variable of all. Colour, in various circumstances, has frequently ex-cited much curiosity, without gratifying it; and this isthe case with the colour of eg-o-s. The esro^s of thebarn-door fowl are white; those of the nightingale of anolive-brown ; and other great differences might be easilymentioned. It is probable, however, that as the
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