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times oil the boundary-line, as C, C', C", C". To the left and to 

 the i-iirlit ("'A and C"'A' arc tlie mid-ventral lines of the neck, 

 CB and ("/i tliose of the trunk. COED corresponds to tlie line 

 (U-awn on the cxtremily, Avhilst the skin of the lingers, heginnin"- to 

 count from cranial to caudal part, is j)laced as follows : half of the 

 plant of the 3^' linger, the plant of the 2/^ tinger, (hat of the thumb, 

 the back-(nail)side of thumb, 2^^ 3"^', 4''^ and 5"^^ fingei-, die plant of 

 the 5^*1 and 4^'' tinger and the other half of tiie plant of the 3^^ 

 finger. Two white spots indicate the |)Osition of the olecranon and that 

 of the epicondylus humeri medialis. 



TJie IVh dermuionia. 



On October 3'd 1902, on a strong foxdog, designed as dog VI, by means 

 of an incision in the skin to the left of the mid-dorsal line (in order to 

 spare the dorsal nerve-branches of the neck to the right), the spinal column 

 is discovered from the 4tii-l4th processus spinosus, and the arches of the 

 6tii-i4th vertebra are opened. Autopsy on October 8tii confirms afterwards 

 that to the right the 7''', 8ti\ 9^^^ lO^'s 12f>\ 13th and 14'^ pair of spinal roots 

 have been cut through, and that to the left the 11^^ root is cut through. 



Reproductions on a reduced scale (fig. I) of the outlines of the photos 

 and skin, represent the results of the determination of sensibility for maxi- 

 mum stimuli, performed on the b^^\ 6^'» and TH' of October. On the rigJit 

 part of the body a sensible area is found, bounded cranially by an insensible 

 zone, interrupted in its ventral, caudally by an insensible zone, interrupted 

 in its lateral part (see fig. I, 1 and 2 and the right side of 5). 



a. The dorsal portion of the cranial insensible zone is bounded cranially 

 by a boundary-line, starting perpendicularly from the mid-dorsal line at the 

 Tfh vertebra, reaching after 10 cm. the spina scapulae 3 cm. belov^ the 

 acromion, then turning first in a cranial, afterwards again in a caudal 

 direction, and continuing on the upper-arm towards the epicondylus humeri 

 lateralis (the leg being stretched) (see fig. 1, 1). Nearly 5 cm. before reaching 

 this latter, it takes a bend, slowly continuing in a caudal direction towards 

 the epicondylus humeri medialis, which it does not reach either (see fig. I, 2). 

 It then turns towards the mid-ventral line, approaching it to a distance 

 of 6 cm., enters profoundly into the axilla, and bends, continually deviating 

 in a caudal direction, into the caudal boundary line of the insensible dorsal 

 part. This caudal boundary line, directed towards the olecranon, parallel 

 with the plica axillaris posterior (see fig. I, 2), forms an angle of 90° with 

 itself before reaching the olecranon, continues in caudal direction, reaches 

 the dorsal side of the upperarm, turns again rectangularly, and continues, 

 with the exception of a caudally directed curve, straight unto the mid- 

 dorsal line, which is reached at the 9^'» vertebra (see fig. I, 1 and 5). 



h. The ventral part of the cranial insensible zone is found as a triangularly 

 shaped area, commencing at the third rib, 5 cm. below the manubrium 

 sterni. 



c. The dorsal part of the caudal insensible zone is shaped like a sugar- 

 loaf (see fig. I, 1 and, 5). The cranial boundary-line has its origin between 



