( 398 ) 



returns, taking a rectangular bend, as the caudal boundary-line of the anterior 

 insensible zone, after having made a caudal outward curve at the spina 

 scapulae (3 cm. from the acromion) to the mid-dorsal line between the 

 8^^ and 9^^ vertebra. 



The caudal insensible zone is interrupted. The dorsal part forms a triangle, 

 whose basis begins between the 9^'^ and lO''» vertebra and ends above the 

 13th, (see fig. II, 1). 



To the left are found two insensible spots. One of these, elliptic, opposite 

 the sensible area at the mid-ventral line (see fig. II, 2 and 4). The other, 

 likewise elliptic, having its longitudinal axis perpendicular to the mid- 

 ventral line, and including olecranon and epicondylus humeri. 



The Qtfi dermatoma. 

 On December 5'^ 1902, by a similar operation as before, on a strong grey 

 foxdog, designed as dog IX, to the right the 5'^^ gth^ 7111^ g'^, iO'i\ nth and 

 12fh pail' of roots are cut through. To the left the 9"» is cut through. Autopsy 

 on Dec 9fh confirms this having been performed. On September ö^h -[902 

 on a strong brown female dog, designed as dog I, to the right the S^h and 

 9'h root, to the left the 9'h root are cut through. Autopsy again confirms this. 

 Fig. Ill 9th root. 



Dog IX. 9th root isolated to the right by cutting through 



''the oth, 6'h, T^h^ 8* lO^h^ n^ 12th and IG^h root, 



cut through to the left. 



