AOS M. J. GREENMAN 
The results of these examinations are given in table 3. In 
this table the animals are arranged in the order of their increasing 
age. In all four pneumonia cases where the comparison can be 
made it will be observed that there was a marked loss from a 
previous maximum body weight, due most likely to the disease. 
The normal weight for King’s inbred strain of albino rats is 
313.8 grams at 243 days, 332.3 grams at 334 days, and 358.7 grams 
at 455 days of age. These weights are from H. D. King’s un- 
published records. 
It will be seen that the rats were all very much under normal 
weight at the time of killing. 
If, for greater accuracy, we omit from our consideration the 
females No. 424, a ‘pneumonia’ animal, and No. 446, a control 
animal, and compare the average number of fibers from the right 
‘and left peroneal nerves of No. 352, a ‘pneumonia’ animal with the 
average number of fibers from the right and left peroneal nerves 
of No. 353, its control, we find the ‘pneumonia’ animal presents 
an average of 2235 fibers while its control gives an average of 
2268 or 33 more fibers. If, in ike manner, we compare the aver- 
age number of fibers from No. 425 a ‘pneumonia’ animal with the 
average number from No. 426, its control, we find the average 
in the ‘pneumonia’ animal to be 2075 fibers while the average of 
its control is 2143 or 68 more fibers. 
When we compare the average sectional areas of the fibers of 
the right peroneals of the ‘pneumonia’ rats with the correspond- 
ing averages of their controls, we note that these averages are 
practically the same, while in case of the left side the ‘pneumo- 
nia’ rats show somewhat larger fibers. The combined averages 
of right and left fibers of the ‘pneumonia’ rats differ very slightly 
from the combined averages of their controls. 
The axis sheath relation in both ‘pneumonia’ rats and their 
controls (members of same litter) is practically 40 per cent axis 
to 60 per cent sheath, a relation found to exist in a group of 15: 
normal inbred rats 150 days of age, as shown by table 4. 
Examination of this small group of animals reveals no signif- 
icant changes in the sectional area of fibers or in the axis-sheath 
relation as the result of disease (pneumonia). 
