. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. d into anoutward activity, which makes them instinctively watch over the new gen-eration, nurse and take care of it. It is no longer the body of the nurse,but its own instincts, which become the instrument of the seems to receive confirmation from the fact that the working bees,like the plant-lice, are barren females. The attributes of
. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. d into anoutward activity, which makes them instinctively watch over the new gen-eration, nurse and take care of it. It is no longer the body of the nurse,but its own instincts, which become the instrument of the seems to receive confirmation from the fact that the working bees,like the plant-lice, are barren females. The attributes of their sex, inboth, seem to consist only in their solicitude for the welfare of the newgeneration, of which they are the natural guardians, but not the task of bringing forth young is confided to other individuals, .o thequeen among the bees, and to the female of the last generation amongthe plant-lice. Thus the barrenness of the working bees, which seemgan anomaly as long as we consider them complete animals, receives1 very natural explanation so soon as we look upon them merely asniifses. 164 REPRODUCTION. ally rormcd the four corners {h f) become elongated, and,by degrees, are transformed inio tentacles, (c.) Taese 0 S 2 y. e f 9 <entacles rapidly multiply, until the whole of the uppermargin is covered with them, [g.) Then transversewrinkles are seen on the body, at regular distances, ap-pearing first above and extending downwards. Thesewrinkles, which are at first very slight, grow deeper anddeeper, and, at the same time, the edge of each segmentbegins to be serrated, so that the animal presents the ap-pearance of a pine cone, surmounted by a tuft of tentacles,(A ;) whence the name of Strobila, which was originallygiven to it, before it was known to be only a transient stateof the jelly-fish. The separation constantly goes on, until atlast the divisions are united by only a very slender axis, andresemble a pile of cups placed within each other, (^^)The divisi
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectp, booksubjectzoology
