
doi: 10.1038/113196a0 , 10.1038/112759b0
IN the issue of NATURE for November 3, p. 653, there appears a letter from my old friend and former colleague, Mr. H. M. Fox, in which he records an attempt which he made this summer to repeat Dr. Kammerer's experiments on Ciona. These experiments consisted in inducing an abnormal growth of the siphons of Ciona by repeated amputation. Mr. Fox amputated the siphons of Ciona, but the length of the regenerated siphons was normal.
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