DoNnALDSON AND Davis, Human Spinal Cord. 25. 
on a scale of one linéar millimeter for each square millimeter in 
the area of the transverse section of the cord. The original 
charts thus made, were too large to publish, and have therefore 
been reduced photographically to exactly one-third their linear 
dimensions. As a consequence of this reduction, multiplying 
the length of the ordinates in the accompanying chart by three, 
will give a line as many millimeters long as the section has 
square millimeters of area, and multiplying the length of any 
segment in the chart by three will give the length of the seg- 
ment as represented in the column of averages in Table 1. 
The data for the areas of the cross sections represented by 
the ordinates were taken from STILLING (3) and comprise his. 
measurements on four adult cords. 
TABLE IV. 
Giving the pages in STILLING’s ‘‘Neue Untersuchungen iiber den Bau 
des Riickenmarks’”—1859, where the records are to be found. 
Designation 
of Curve. Sex. Age. Pages. 
A Male 45 years Page 1098 
B Woman 35 years Page 1100 
Cc Woman 25 years Page 1099 
D Male 25 years Page 1097 
The sections from each segment of these cords are also 
depicted in Table XXVIII of Sritttne’s Atlas (1859). 
This is the place to call attention to the condition of the 
cords measured by Stitiinc. All of the measurements of 
areas used in this present article—including those on the imma- 
ture cords to be mentioned later on—were made on material 
hardened in chromic acid and preserved in 97% alcohol. 
STILLING makes a statement of his method on pp. 1032 and 
1033, but it appears to be erroneous in that it calls for so large 
an amount of chromic acid, practically an 8% solution. Pre- 
liminary observations made on the spinal cord of the white rat, 
hardened in chromic acid 0.6%, followed by 97% alcohol, in- 
dicate a slight increase in the volume of the cord after this 
treatment. This suggests that these measurements by STILL- 
