An Introduction to Zoology
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A subsequent resting period is followed by the breaking away of the outer chitinous envelope and the elongation of the escaped embryo. Mesoglea is now secreted by the ectoderm and ento- derm cells; a circlet of tentacles arises at one end and a mouth appears in their midst. The young Hydra thus formed soon grows into the adult condition.
Regeneration. An account of the phenomenon of regenera- tion is appropriate at this place, since the power of animals to restore lost parts was first discovere...d in Hydra by Trembley in 1740. This investigator found that if Hydras were cut into two, three, or four pieces, each part would grow into an entire animal. Other experimental results obtained by Trembley are that the hypostome together with the tentacles, if cut off, produce a new individual; that each piece of a Hydra split longitudinally 138 AN INTRODUCTION TO ZOOLOGY into two or four parts, becomes a perfect polyp (Fig. 64, A) that when the head end is split in two and the parts separated slightly a two-headed animal results; and that a specimen when turned inside out is able to readjust itself to new conditions forced upon it.
What to read after An Introduction to Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Robert William Hegner to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
A subsequent resting period is followed by the breaking away of the outer chitinous envelope and the elongation of the escaped embryo. Mesoglea is now secreted by the ectoderm and ento- derm cells; a circlet of tentacles arises at one end and a mouth appears in their midst. The young Hydra thus formed soon grows into the adult condition.
Regeneration. An account of the phenomenon of regenera- tion is appropriate at this place, since the power of animals to restore lost parts was first discovere...d in Hydra by Trembley in 1740. This investigator found that if Hydras were cut into two, three, or four pieces, each part would grow into an entire animal. Other experimental results obtained by Trembley are that the hypostome together with the tentacles, if cut off, produce a new individual; that each piece of a Hydra split longitudinally 138 AN INTRODUCTION TO ZOOLOGY into two or four parts, becomes a perfect polyp (Fig. 64, A) that when the head end is split in two and the parts separated slightly a two-headed animal results; and that a specimen when turned inside out is able to readjust itself to new conditions forced upon it.
What to read after An Introduction to Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Robert William Hegner to read onlineMoreLess
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