. Agricultural zoology. Zoology. INTRODUCTION. 15 the offspring generally resemble their parents. But it is also a fact recognized by the stock-breeder, that a particular animal wiU not only transmit several of its own characteristics to its offspring, but perhaps also various characteristics of the grandparents or of animals belonging to stiU more remote generations, although these characteristics are not visible in the. Fig. Y.—The Small-winged Gall-fly, d (Andricus terminalis), lays its eggs separately in the rootlets of oak. Eoot-galis (a) result from this, and inside of each of them a lar
. Agricultural zoology. Zoology. INTRODUCTION. 15 the offspring generally resemble their parents. But it is also a fact recognized by the stock-breeder, that a particular animal wiU not only transmit several of its own characteristics to its offspring, but perhaps also various characteristics of the grandparents or of animals belonging to stiU more remote generations, although these characteristics are not visible in the. Fig. Y.—The Small-winged Gall-fly, d (Andricus terminalis), lays its eggs separately in the rootlets of oak. Eoot-galis (a) result from this, and inside of each of them a larva develops which, after a metamorphosis, becomes a relatively large, wingless gall-fly (c) known as BiorMza aptera. This pierces tlie oak-huds in early spring, and lays a large number of eggs in them ; from part of the bud is formed a large juicy gall (6), containing several larvse, from which the small-winged gall-flies (d) develop. The species here represented exist, therefore, in two forms, e and d (Heterogeny). animal which is actually breeding (Reversion, Atavism). Among insects and the lower animals there are species which, as adult animals, appear not in one form, but two or several. In this case, as a regular thing, the offspring does not resemble the parents, but the grandparents, great-grandparents, or. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bos, Jan Ritzema, 1850-1928; Ainsworth Davis, J. R. (James Richard), 1861-1934. London, Chapman & Hall, Ld.
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