Publisher's Synopsis
Excerpt from Contributions to the Natural History of the United States of America, Vol. 2: First Monograph, in Three Parts
As the egg grows larger, the dark outline decreases in thickness, and the contents become less oily and more transparent, till at last, when it is about film, of an inch in diameter, a well defined wall discloses itself under the guise of a thin pellicle (pl. 8, fig. 1, f, g).
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