Identifier: regenerationmorg (find matches)
Title: Regeneration
Year: 1901 (1900s)
Authors: Morgan, Thomas Hunt, 1866-1945
Subjects: Regeneration Regeneration (Biology)
Publisher: New York, The Macmillan Company London, Macmillan & Co., ltd.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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may be usedthat will enable us to characterize briefly different classes. When thenew part is like that removed, or like a part of that removed, as whena leg or a tail is regenerated in a newt, the process is one of homo- 1 Hertwigs description of the method by which a piece of hydra makes a new one showsthat he did not understand the kind of change that takes place in this animal. 2 Organographie der Pflanzen, 98. 24 RE GENERA TION morphosis. ^ Under this heading we may distinguish two cases, in oneof which the entire lost part is at once, or later, replaced — holomorpho-sis; in the other the new part is less than the part removed — mero-morphosis. When the new part is different from the part removed theprocess hasbeen called by Loeb heteromorphosis, but there are at leasttwo different kinds of processes that are covered by this definition.In one case the new part is not only different from the part removed,but is also an organ that belongs to a different part of the body (or it
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Fig. 12. — After Herbst. Diagram showing brain, eye, and heteromorphic antenna (in placeof eye of one side) of palasmon. The animal had lived in a dark aquarium for five months. may be unhke any organ of the body). This we may call neomor-phosis. As an illustration of this process may be cited the develop-ment of an antenna, when the eye of a crab or of a prawn is cut offnear the base (Fig. 12); and as an example of an organ different inkind from any organ of the same animal, may be cited the case ofAtyoidapotimiriim, in which the new leg is unlike any other leg onthe body. The name heteromorphosis can be retained for thosecases in which the new part is the mirror figure of the part fromwhich it arises, or more generally stated, where the new part has 1 This term is used by Driesch in his Analytische Theorie. GENERAL INTRODUCTION 2$ its axes reversed as compared with the old part. As an example ofthis may be cited the development of an aboral head on the pos-terior end of a piece of

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