406 M. J. GREENMAN 
A second test was therefore made using, in this case, an albino 
rat suffering from so-called ‘pneumonia.’ This animal had 
dropped from 264 to 184 grams in body weight in 66 days. Au- 
topsy showed badly infected lungs with hemorrhagic areas and 
pus cavities. 
A brother from the same litter was used as a control for this 
animal. The control animal had increased in body weight from 
267 to 315 grams during the same period of 66 days. Autopsy 
negative. 
TABLE 2 
NUMBER OF 
FIBERS IN PERO- 
WEIGHT| NEAL NERVES 
AVERAGE SECTIONAL AREA OF FORTY LARGEST 
FIBERS IN SQUARE MICRA 
KILLING Right Left 
Right:||" Weft). 2 ee ee 
Fiber | Axis | Sheath] Fiber | Axis | Sheath 
3520) 251 184 | 2240 | 2280 | 100.2) 39.6 | 60.6 | 122.2) 45.9 76.3 
(pneumonia) 
Combined average of right and left 
Fiber 111.2 Axis 42.7 Sheath 68.4 
3530 251 315 | 2240 | 2296 | 124.9) 46.8 | 78.1 | 108.8) 43.1 | 65.7 
(control) 
Combined average of right and left 
Fiber 116.8 Axis 44.9 Sheath 71.9 
Table 2 gives the summarized records of the examinations 
made of both right and left nerves from both the ‘pneumonia’ 
animal and its control. In this case the technique followed was 
the same as in the first test. Forty of the largest fibers of each 
nerve were measured in this instance, giving the sectional area 
of the entire fiber, its axis and its sheath in square micra. 
It will be seen from table 2 that in the diseased animal the 
average sectional area of the 40 largest fibers from the right 
nerve is less, while the average sectional area of the 40 largest 
fibers from the left nerve is greater than in the corresponding 
fibers of the control animal. If the averages from the right and 
