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- … Fig. B.—1, Currant gall on leaf: 2, ditto on male flowers; 3, ditto andsection. cotton wool more than anything else. It is very curious thatthe grubs, which are so much alike in every way, though be-longing to different species, should cause the growth of gallsso very dissimilar in appearance. The…
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