Guanidinノ神經繊維ノ興奮性ニ及ボス影響

The author made experiments to research in the influences of guanidin on the excitability of nerve-fibres, and has come to the following conclusious: 1) Guanidin has no effects at all on the medullated nerve-fibres. 2) Guanidin increases the excitability of a nerve-fibre when asphyxiated even at the medullated part. 3) Wenn the chemical is made act on the non-medullated nerve-fibre of the limulus heart, it increases its excitability. From the above results it is concluded that guauidin has the iufluence on the nonmedullated part of nerve-fibres so as to promote their oxcitability contrary to general belief, that it affects only the endings of nerve-fibres.