The Journal of experimental zoology . Fig. 11 Photomicrograph of a frontal section of a triangular piece of Group D,showing nervous system in form of a ring surrounding tissue from the digestiveorgan (cf. fig. 10 a and 6). states, The new brain is almost an exact counterpart of theold; and the two together form an almost circular structure. Lang (12) and others (Flexner, 98; Stevens, 01; Shultz, 02),as opposed to Lehnert (91) and Bardeen (01), claim that in theregeneration of planarians the new nerve cord arises de novoin the new tissue at the ends of the old nerve cords, and never 168 J. M. D
The Journal of experimental zoology . Fig. 11 Photomicrograph of a frontal section of a triangular piece of Group D,showing nervous system in form of a ring surrounding tissue from the digestiveorgan (cf. fig. 10 a and 6). states, The new brain is almost an exact counterpart of theold; and the two together form an almost circular structure. Lang (12) and others (Flexner, 98; Stevens, 01; Shultz, 02),as opposed to Lehnert (91) and Bardeen (01), claim that in theregeneration of planarians the new nerve cord arises de novoin the new tissue at the ends of the old nerve cords, and never 168 J. M. D. OLMSTED as a proliferation from the old nerve cord itself. All the sectionsI have examined tend to support this view, since the old nervecord presents the same appearance in all stages of regeneration,and the new nervous material is absolutely distinct from the this view is correct, the fact that one eye appears earlier thanthe other, and that this eye is on the same side of the body (inthese triangular pieces) as the old ne
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectzoology
