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Show SELECTINK F0f 1Y ttlfl , ;f OkMrvaUens f ftsturaJlst teem t hw That Insert Are AStraee1 by Certain teent. "There U ataoh la Uj behavier ef certain specie of Insects," say Dec-ter Dec-ter Rones la the Anjerlcna WaturaLbit. "te suggest that food-planta are selected select-ed en he basU of odor by the parent female and also accepted on the same basts by the larvae. Experiments with cabbago butterflies . . . shew that these insects are attracted by the mus-tard mus-tard oils present In these plants, and It has also been shown that caterpillars caterpil-lars wlU feed on other plants which have been treated with one of these oils. The distaste of mosquitoes tot oil of cltronelln Is well known, a Is also Uie nttrnctlvenesi of this same substance for frnlt-fllea of tlie genus Daci'R. . . . Very recently Mcln-rtfco Mcln-rtfco tins published some observations showing that caterpillars readily react re-act to f,ho odors of several essential oils and to those of various plants. Tills, taken together with tho fact that Plerls will feed upon strange plants treated with mustard olt, would suggest sug-gest that odor Is an Important factor In the selection of food-plants." |