Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . FIG. 31.—Section of Sphinxembryo, the germ im-mersed in the yolk, s,serous membrane; am,an in ion; h, outer, m, in-ner, FIG. 32.—Embryo of Sphinx much more , heart; y, ganglion; i, intestine; m, rudimen-tary muscular bands running to the heart; A,stigma and beginning of a trachea it); d, agland.—This and Figs. 33 and 34 after Kowalevsky young insect before hatching is called the embryo, and thestudy of the growth or development of the embryo is calledEmbryology. 36 ENTOMOLOGY. T
Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . FIG. 31.—Section of Sphinxembryo, the germ im-mersed in the yolk, s,serous membrane; am,an in ion; h, outer, m, in-ner, FIG. 32.—Embryo of Sphinx much more , heart; y, ganglion; i, intestine; m, rudimen-tary muscular bands running to the heart; A,stigma and beginning of a trachea it); d, agland.—This and Figs. 33 and 34 after Kowalevsky young insect before hatching is called the embryo, and thestudy of the growth or development of the embryo is calledEmbryology. 36 ENTOMOLOGY. There is a remarkable uniformity in the mode of develop-ment of the winged insects. In general, after fertilizationof the egg, a few cells appear at one end of the egg; thesemultiply, forming a single layer around the egg, this layerconstituting the blastoderm. This layer thickens on oneside of the egg, forming a whitish patch called the primi-tive streak or band. The blastoderm moults, sloughing offan outer layer of cells, a new layer forming beneath; the
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
