448 DAVENPORT HOOKER 
6. A marked tendency on the part of the nerve fibers to avoid 
entering the opposite wound surface of the spinal cord is notice- 
able in these embryos. 
7. These embryos render an analysis of the primary responses 
to tactile stimulation possible. The middle piece is the first 
portion of the body to respond to tactile stimulation and it 
reacts as a unit. 
8. The first type of response to tactile stimulation in these 
embryos is a single contraction of the myotomes on the same 
side as that which receives the stimulation. 
9. In spite of the reversal of a portion of the cord the responses 
to tactile stimulation of these embryos are normal in charac- 
ter, but are somewhat tardy in their appearance. This is par- 
ticularly true of those movements which are coordinated. 
10. Embryos with a nervously isolated reversed middle 
piece are capable of developing a fairly coordinated swimming 
movement by means of the tension of the skin over the body. 
