everal which are, most likely, differentforms of the same insect. I have selected a few of the com-mon and more conspicuous galls for illustration. The vari-ous galls differ very much in appearance and substance.Some, the marble galls (Fig. F) and the artichoke galls (FigD), become quite hard and… … Fig. D.—1, Artichoke gall; 2, ditto, section; 3, internal gall (magnified). them is induced; and that if a grub dies before the gall isfully formed its growth is arrested. The life history of thegallfly is most interesting. Dr. Adler, with the ,nost un-
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