410 M. J. GREENMAN 
cent osmic acid, dehydrated, embedded and sectioned in the 
usual manner. The stimulated nerve and its control were pre- 
pared in the same solutions, thus receiving identically the same 
technical treatment. 
Twelve animals of the same sex and strain and of about the 
same ages were used in these experiments and the results are 
here presented in table 4. 
TABLE 4 
Series 12. All males. Effects (volumetric) of electrical stimulation on the pertph- 
eral nerve fibers. (Peroneal nerve.) 
AVERAGE SIZE OF FORTY LARGEST 
FIBERS IN SQUARE MICRA 
NUM-|riprer| age |werent| strain | AUC Hight peroneal (shel eas 
~ a ao 
‘wo | 2 & a | g a |B 
ee ees ree ee Pema es Reeser ce MANES 
350 162 | 203 | Inbred 2253/2123] 96.0|38.3|57.7|101 .9/39.2/62.7 
363 156 | 261 | Inbred 2080/2143] .68.5|30.2/38.3] 94.5/42.8/51.7 
369} 11 154 | 243 | Inbred | Neg. |2013|2090| 84.3/39.2/45.1/105.8)44.7/61.1 
370} 11 154 | 245 | Inbred | Neg. |2125|2093} 91.3/41.6/49.7/ 90.7|38.9|51.8 
373 - | 150 | 230 | Inbred | Neg. |1912/1903)/107.1|46.7/60.4) 95.9|37.9|58.0 
374| 12 150 | 223 | Inbred | Neg. |1920/1870) 94.2/38.8/55.4) 99.5)41.7/57.8 
375| 12 150 | 218 | Inbred | Neg. |2163/2117| 99.4)44.9/54.5) 95.6)43.2|52.4 
376 149 | 236 | Inbred | Neg. |2058|2038| 88.3/38.6|49.7) 93.643 .9|49.7 
389) 16 155 | 251 | Inbred | Neg. |2020/2122| 94.9)/43.6/51.3/105.7/45.4/60.3 
390} 16 155 | 230 | Inbred | Neg. |2044/2066|) 82.1/36.3/45.8) 83.6)37.2/46.4 
437) 33 150 | 248 | Inbred | Neg. |2166/2150/101 .8|40.4/61.4)110. 6/43 .5/67.1 
438} 33 150 | 237 | Inbred | Neg. |2103)/2113)116.2|52.2/64.0/103 3/43 .4/59.9 
Average...| 153 | 235 2071/2069] 93.7/40.9/52.8) 98.4/41 .8/56.6 
44%|56% 43%|57% 
The age of one animal was 162 days, all the others range 
between 149 and 155 days, and the group for this purpose may 
be considered of one age—an average of 153 days. Autopsies 
made on ten of these animals proved to be negative. ‘Two were 
not autopsied, but showed no signs of disease. It will be noted 
that the average number of fibers on the right and left sides is 
practically identical—right 2071, left 2069—adding further proof 
of symmetry so far as number of fibers is concerned.. 
