480 DAVENPORT HOOKER 
Sections show that both spinal cord and notochord had been 
completely severed (figs. 6 and 7). The mass of tissue which 
has proliferated from the notochordal sheath is less extensive 
than in previous stages and appears to be undergoing resorption. 
Fig. 6 Sagittal section of an embryo killed 7 days after operation. The 
primary reunion of the cord ends is completed by motor and sensory connections. 
(Embryo VIII 63, 14-11). 
Fig. 7 From the same embryo as the preceding figure. The lettering is the 
same as in figures 3 and 5. The motor (M.C.) and the sensory (S.C.) connections 
are shown. (Embryo VIII 63, 14-11). 
Through the looser tissue of the upper portion of this mass pass 
some of the fibrous connections between the ventral portions 
of the two cut ends of the spinal cord. These connectives are 
bundles composed largely of nerves and connective tissue fibers. 
The nerves are continuous with the ventral fiber tracts of both 
