Experiments on the Lateral Line System of Anurans

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Abstract
No inductive effect upon ordinary epithelial cells by the lateral line nerve of Rana clamitans tadpoles was found in 19 expts. involving the transposition of that nerve. No trophic or inductive influence on the part of the lateral line nerve of anurans was necessary for normal regeneration of the sense organs in 36 expts. involving regeneration of tail tips. Dener-vation before, after, or simultaneously with tail tip amputation had no effect upon the time or mode of regeneration of lateral line sense organs as compared with the 17 control cases. Repeated observations were made upon living, denervated lateral line sense organs of the dorsal tail fin of anuran tadpoles and comparisons made with the normally innervated organs on the opposite side. 2,313 sense organs were followed for 6-142 days. These included 37 expts. on hypophysec-tomized Rana species and 30 on normal Rana clamitans tadpoles. In no instance was there any immediate apparent effect of denervation on the sense organs, but only after prolonged denervation was the removal of the trophic action of the nerve on the sense organs made visible by the degeneration of some sense organs.
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