228 JOURNAL OF COMPARATIVE NEUROLOGY. 
exhibit the full extent of the web. For this purpose, threads 
were tied to the first, third and fifth toes, pulled taut and fast- 
ened by pins. The web was stretched until the second toe 
showed a tendency to curl up, and this reaction was regarded 
as indicating the normal extension of the web. When so 
extended, the general outline of the foot is that of a quad- 
rilateral. 
These adjustments having been made, it was determined 
by measurements taken between the two strips of glass, that 
their faces were approximately parallel. Next an outline, 
just outside the contact line of the upper glass with the skin of 
the leg, was made with a pencil on the tracing paper, starting 
from the uppermost part of the thigh on one side, and follow- 
ing around the entire outline of the leg to the uppermost part 
of the thigh on the opposite side. The upper limit between 
the skin of the body and that of the thigh was marked by the 
adjustment of the glass strips, and the levels of the knee and 
ankle joints respectively, were fixed by passing needles through 
these joints when preparing the leg for this examination. By 
drawing, therefore, a line across the tracing paper at these 
several levels, the outlines for the thigh, shank and foot were 
obtained. It was assumed that the outline on the dorsal aspect 
of the leg would be similar to the one found on the ventral 
aspect. To obtain the areas for the sides of the leg, the dis- 
tance between the two glasses at the hip, knee and ankle was 
measured and the length of the curved line (the ‘‘coast line’) 
forming the lateral boundary in the case of the thigh and 
shank, taken on each side, by means of a waxed thread applied 
to the outline. This gave the initial measurements for the cal- 
culation of the area of the skin of the thigh and shank. Con- 
cerning the foot we shall speak later. 
To illustrate the determination of the area for a given 
segment, let us take the thigh. In this case we have the area 
marked on the tracing paper between the boundary separating 
the thigh from the body and that separating it from the shank. 
The content of this area was determined in square millimeters 
by means of a planimeter and then doubled so as to include the 
