On the length of the internodes in the sciatic nerve of Rana temporaria (Fusca) and Rana Pipiens: Being a re‐examination by biometric methods of the data studied by boycott ('04) and takahashi ('08)

In 1904 Boycott published an important paper on the length of the internodes under the title " On the number of nodes of Ranvier in different stages of the growth of nerve fibers in the frog."In this work he measured 5338 internodes from twenty-six frogs which ranged in body length from 14.5mm.to 53.9mm.Although his observat,ions were limited to the fibers from the thigh taken at the division of the sciatic nerve into the n.tibialis and n. peroneus, they nevertheless give us definite information as to the lengthening of the internodes first in relation to the lengthening of the leg, and second in relation to the increase of the fibers in diameter.Four years later (1908) Takahashi published a paper on the same subject under the title "Some conditionswhich determine the length of the int8ernodes found on the nerve fibers of the leopard frog, Rana pipiens; " and in this investigation he examined several new points.' Takahashi's observations were made not only at three different levels in the thigh, but also at levels in the shank and in the foot, as well as on some of the spinal nerve roots.He measured altogetlher 3068 internodes from eight, frogs mostly of a larger size than those used by Boycott.The body lengths of Takahashi's specimens ranged from 39.0 mm. to 89.4 mm.r -0.