Experiments n2 Transplanting Limbs 265 



as usual into the peroneal and tibial nerves. The former runs to 

 the skin as the r. cutaneus cruris lateralis and I have been unable 

 to find a continuation of the main trunk down the shank. The 

 tibial nerve, as far as can be made out, runs entirely into the 

 r. superficialis, the latter may be traced past the tibio-tarsal joint. 



In comparing the innervation of the four transplanted extrem- 

 ities in the present case, it is seen that the primary "aneurogenic" 

 limb has the most complete system of nerves, no important nerve 

 being absent. Next in order comes the primary normal trans- 

 planted leg, in w^hich, as far as studied, only the n. cruralis is lack- 

 ing, though there is a nerve which probably represents the r. cuta- 

 neus femoris lateralis. The accessory aneurogenic leg is third; 

 it lacks the crural nerve and some branches below the knee; the 

 nerves could not be traced with certainty into the foot. The least 

 complete system of nerves is in the accessory normal transplanted 

 leg, where the sciatic nerve and its branches are much smaller 

 than in the other limbs and no muscular branches are found below 

 the knee. Oddly enough, however, there is a well developed cru- 

 ral nerve in this limb though it is entirely absent from the primary. 



Experiment 11."^^ For this experiment larvae of Bufo lentigi- 

 nosus were used. The procedure differed from the previous case, 

 in that no normal limb was transplanted to the left side. Two 

 nerveless hind limb buds were used; these were taken from a 

 specimen from which the spinal cord had been removed one week 

 before. The first limb transplanted was accidentally pushed 

 through the wound into the body cavity. The second remained 

 attached in the body wall. The larva grew rapidly and was pre- 

 served in Tellyesniczky's fluid thirty-five days atter transplan- 

 tation of the limb. As is readily seen in Fig. 6, the second of the 

 transplanted buds has developed into a pair of hind legs, which 

 are connected with the body by a short narrow stalk. Dorsal to 

 these two legs, which are normally formed, there is an irregular 

 mass, which sections show to have developed out of the bud that 

 was pushed into the peritoneal cavity. Two hind legs are dis- 

 tinguishable in this mass but they are very irregularly developed 



^Record number, Tr. Ext. 15. 



