The lateral (dorsal) parts of the gracilis major, adductor magnus, rectus femoris, abductor magnus, vastus externus and semimembrano-sus are innervated by the 9th spinal nerve, the medial (ventral) parts by the eighth. If the incision is made not far from the lateral border of these muscles, the lateral strip is innervated exclusively by the 9th spinal nerve. If, however, the incision is made not far from the medial rim, the medial strip is innervated exclusively by the 8th spinal nerve. The semitendinosus is innervated only by the 8th spinal nerve. The muscles can be stained after intravenous injection of acid fuch-sin. Sometimes, after stimulation and fatigue of the 8th spinal nerve the part of the 8th myotone represented in the gastrocnemius or tibialis anticus longus may be redder than the rest. If, after fatigue of the muscle, the frog is hung in the thermostat at 37[degree] C, the 8th myotome has, after about 3 hours, passed into rigor mortis. This is evident from the white discoloring. The whole of the myotome may be colored in this way. For vital staining "light green" may also be used. The presence or absence of an overlap of the myotomes is submitted to discussion.