f 400 ) 



5'^ finger on the back of the hand, and rising straight over the extensors 

 of hand and fingers, between olecranon and epicondylus humeri lateralis, 

 to the tricepstendon, which is crossed by it. On the foreside of the m. triceps 

 it meets again its point of starting (see fig. Ill, 1). 



Dog I: to the left are found two insensible spots. One of these is a very 

 small one against the mid-ventral line at the affixion of the second rib. 



The other, elliptic, having its longitudinal axis in that of the arm, is 

 bounded by a line beginning high up in the axilla, continuing in the direction 

 of the olecranon and avoiding this, passing on the dorsal surface of the 

 extremity. It continues over the sinews of the extensors of hand and fingers 

 until 1 cm. before the plant, returns then on the ventral surface, crossing 

 there the flexores, and passing beyond the plica cubiti cranially from the 

 epicondylus humeri medialis, it takes a bend over the m. biceps. Crossing 

 this muscle it reaches again, deviating in a caudal direction, its starting- 

 point high up in the axilla. 



The 8<-ti + the 7'^' dermatoma. 



On October 10"' 1902 on a small black female dog, designed as dog VIII, 

 are cut through to the right the 4^^, m\ m\ 9'i\ lO^^i, 11th and 12»' pair of 

 roots. To the left the 8*^ pair of roots is cut through. Autopsy on Oct. 13"' 

 verifies this. A reproduction of the result is found in fig. IV. To the right 

 is a sensible area, encompassed by a large, continuous insensible zone, 

 extending dorsally from the 3'^ to the 13"' vertebra. Ventrally it extends 

 from 5 cm. above the manubrium unto 1 cm. below it. Somewhere between 

 the 2^^ and 3'^ rib its ventral boundary-line passes beyond the mid-ventral 

 line to the left. The boundary-line of the sensible area begins at 1 cm. 

 caudally of the acromion, goes straight to the epicondylus humeri lateralis, 

 and accompanies the ulna unto the fore-plant (see fig. IV, 1 and 3), then 

 taking a sudden turn, it makes for the ventral surface of the extremity, 

 that is reached halfway the fore-arm, crosses it obliquely through the elbow, 

 regains the dorsal side on the upper-arm, and rejoins its starting-point below 

 the acromion. 



To the left no insensibility is found on the extremity, with the exception 

 of a small insensible spot at the mid-ventral line of the trunk. 



The 9t-h -\- the 10 tl' dermatoma. 



On Sept. 22*1' 1902 on a dark male dog, designed as dog V, are cut through, 

 to the right the A^^, 5^^, 6"', 7"', 8"', ll^i', 12"', 13^^ and 14"' pair of roots. 

 To the left the 10"' is cut through. 



Autopsy on Sept. 28^'' confirms this having been performed. A reproduction 

 of the results is given by fig. V. 



To the right two insensible zones encompass a sensible area. The cranial 

 boundary-line of the cranial zone extends from the 3''^' vertebra to the mid- 

 ventral line 4 cm. above the sternum. The caudal boundary-line of the 

 caudal zone extends from the 13"* vertebra to the mid-ventral line, nearly 

 perpendicular to the longitudinal axis of the animal. 



The cranial boundary-line of the sensible area starts from the mid-dorsal 

 line at the 8^^ vertebra and continues straight towards the epicondylus 



