Identifier: problemofagegrow1908mino (find matches)
Title: The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907
Year: 1908 (1900s)
Authors: Minot, Charles Sedgwick, 1852-1914
Subjects: Old age Growth Death Aging Growth Death
Publisher: New York, Putnam
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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a little feeler which wecall the antenna. The particular kind of arthropod,the antenna of which has been studied and drawingsof it made to furnish us this plate, is known by thename of Oniscus. In his researches the experimenter.Dr. Ost,^ cut off the antenna in the middle of a jointand found that it rapidly healed over. Here are pic-tured the stages of the progressive restoration. Partof the antenna has been cut off in this case; the woundwas healed over here, No. i, a, the new tissue hasbegun to grow. No. 2, b, and the cells at this pointare very simple in character. They spread out andgrow, and then, within the interior of the hard shell ofthe feeler, a retraction of the substance occurs, andthe new growing cells within this space gradually be-gin to shape themselves out. No. 3, b, and we seepresently an accumulation of cells which is assuming 1 Ost, T-. Zur Kenntniss der Regeneration der Extremitaten bei den Arthro-poden, Archiv f. Entwickehtn^smechanik, xxii., 289-324, pis. x-xii.
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Fig. 70. Longitudinal Sections through the An-tenna OF Oniscus IN Various Stages of RegenerationAFTER Amputation.—After Ost. a, cicatricial tissue; b, regenerated tissue ; cu, cuticula, orouter shell; gl, glands ; pig, pigment. Magnified. 208 REGENERATION AND DEATH 209 a definite form, No. 4, d, that in the next figure hasclearly become the promiseor beginning of a new ter-minal joint, Fig. 71, whichwill become free when at thenext moult the old shellor cuticle is cast off. Theminute study of this processhas shown that the regenera-tion depends practically ex-clusively upon the cells of theyoung type, and that afterthey have grown out and ac-cumulated here in this man-ner, No. 3, d, some of themundergo differentiation, be-coming muscle cells; otherschange in the manner indi-cated here, No. 4, where wesee a commencing alterationof the nuclei, which is furtheraccented in Fig. 71, and leads , . r , 11 Fig. 71. Section through to such a groupmg of the cells ^ regenerating antenna of tha

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