al progress of the present age, the history of the steam formations. Meantime he has searched in vain for any sat- engine, the telegraph, and other inventions, the influence of isfactory account of the singular features of the reproduc- which would be to impel the students to em- tion of the insect… … manner of the Aphides. Mr. Gibson illus - sudden and large demand for the cereals of trates by numerous drawings the various stages in the de- the Pacific slope, and the farmers of that region prosper ac- [ In these diagrams the observer las evidently given pre- velopment of this strange insect, as…
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