Forest entomology . 142 FOREST ENTOMOLOGY. gall-fly — Netiroterus lenticularis — deposited eggs in the bud andproduced the currant gall; and the gall-flies of Spathegaster baccarumor currant gall produced the spangle gall. In short, flies of the onespecies deposited its eggs and produced the galls and flies of the otherspecies. Thus Adler demonstrated to the scientific world what hadonly been previously guessed at—viz., the important biological lawof the alternation of generations in oak galls. This is a very importantbiological law which is not uncommon amongst certain animals com-paratively
Forest entomology . 142 FOREST ENTOMOLOGY. gall-fly — Netiroterus lenticularis — deposited eggs in the bud andproduced the currant gall; and the gall-flies of Spathegaster baccarumor currant gall produced the spangle gall. In short, flies of the onespecies deposited its eggs and produced the galls and flies of the otherspecies. Thus Adler demonstrated to the scientific world what hadonly been previously guessed at—viz., the important biological lawof the alternation of generations in oak galls. This is a very importantbiological law which is not uncommon amongst certain animals com-paratively low in the scale of organisation, and is no doubt essentialto the wellbeing and continuation of species. In view, therefore, of.
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