MYELINATED FIBERS—-PERONEAL NERVE OF RAT 407 
left nerve fibers of each animal are combined it will be seen that 
the fibers of the diseased animal are slightly less in area than 
those of the control animal. The difference, (5.6 square micra) 
however,.is slight and probably insignificant. The axis-sheath 
relation in both animals is the same—38.5 per cent axis to 61.5 
per cent sheath. 
This test left the matter in doubt, but it seemed desirable to 
examine other cases of diseased animals. 
‘PNEUMONIA’ RATS 
For this further work, three groups of so-called ‘pneumonia’ 
rats were examined—each group being controlled by a healthy 
animal from the same litter. 
TABLE 3 
Series 14. Pneumonia rats and controls from same litters 
Pneumonia rats 
S 3 AVERAGE SIZE OF FORTY LARGEST 
a ei NUMBER FIBERS IN SQUARE MICRA 
tal ES OF 
S FIBERS : 
STRAIN Saltese AUTOPSY Right peroneal Left peroneal 
: e8| 88 
a on qj | 
2] Q jst S| =] be he oe) 
a ae BE | aH Sf Se ae ele le lee 
2 PUES? eee A z [ent 4 ca <i n cs < nD 
352|/o7| 7/251|/Ext.-inbred* 184 | Pneumonia |2240/2230/100 . 2/39 . 6/60. 6/122 .2/45 .9|76.3 
424) 9} 29/335|Ext.-inbred | 213/177 | Pneumonia |2122/2000/137 .3/57.2/80.1/161.2|66.7)/94.4 
425| | 29/335/Ext.-inbred | 395/282 | Pneumonia |2145/2006/133 .5/53.7/79 .8)135.9|55.6/80.4 
Control rats 
445| 7| 35/454| Inbred 342/201 | Pneumonia |2047|1988/128 . 2/53 .0/75.1)119.3|47 .9/71.4 
447) | 35/454| Inbred 331/292 | Pneumonia |2040)1916/115. 4/47 .5|67 .9)132.9|57.4/75.5 
AV@nagenasin masta sir)s Wade ar5l ohio bes ieee 2119/2028/122 .9|50.2/72.7|134.3|54.7/79 .6 
40% |60% 40% |60% 
* Extracted inbred albino rat. 
353/o"| 7/251) Ext.-inbred 315 Neg. 2240|2296)124 9/46 .8/78.1/108.8/43. 165.7 
426|o7| 29/335) Ext.-inbred | 355/347.5 Neg. 2122)/2165/139 . 8/52 .5|87 .3/180.8/52.2/78.5 
446| 9 | 35/454| Inbred 248/208 Neg. 1973|1863|109 9/44 .4/65.4)127.5)55.1/72.4 
Apenpe Atak... x. ol eee RANT ERTS 2111/2108|124 .9}47 .9/76 .9|122.3/50.1/72.2 
38% |62% 41%|59% 
