lly ones just mentioned areboth found on the male flowers of the oak, and have nopoint of similarity. These differences may, however, be the result of the gruboccupying a different position in the bud or flower, onespecies placing its eggs in a different layer of cells to theother. A question which… … Pig. E.—Oak apple gall; 2, ditto, section. wearying patience and perseverance, has proved byverycare-fully made experiments that gall flies which had hithertobeen considered as different species, which made very dis-
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