3; 
wo 
TRICHOLOGIA MAMMALIUM ; 
Fig. 58. G_ 
i St ae ey * 
ee er a \ 
ee | ~ Ts a } \ 
fo of ~ Pal \ *s \ 
3 & \ RS ¢ 
i Z| \ * | < { * ¥ 
i _Oue | Inch 4 | One | Inch os One |foch 
: | | 2 = 4 
| | k < nae || . 
= ‘ rs 4] a : 3 | 
N ‘ ell \ 
: Se / \ = / 
SS == T — — j 7 A =f / 
re _ | WN 
In this figure, A, B and C, represent, respectively, the cylindrical, the oval, and the 
eccentrically elliptical, as in the previous one. ‘“a,’’ marks a line half way between the 
cylinder and the oval. The pile belonging to this space, called ‘ cylindroidal,’ have a 
form where one diameter exceeds the other by less than 3. All pile belonging to the 
other half of the distance between the cylinder and the oval, viz: whose greatest diameter 
exceeds that of its smallest 3, but does not reach the 2, are called the ‘lesser ovoidal.” 
“),”” marks a line equi-distant between the oval and the eccentrically elliptical. All pile 
on the oval side of this line, having its greatest diameter more than 2 of its smallest, but 
less than 3, we call ‘“ greater ovordal ;” and all pile on the other side of that lime, where the 
greatest diameter exceeds its smallest by more than 2, but by less than 4, we call eccentrically 
elliptoidal. ‘These dimensions have been explained, because they include all those known 
to belong to the hair of the human head. For practical purposes, it is not often necessary 
to regard any more than the three general forms; throwing the ‘odals’’ into the classes 
from which they are derived. 
To whom they belong—TVhe next step is to show to whom piles of these dimensions 
belong. 
A is a representation of the shape of a hair of the head of a full-blood Choctaw Indian 
of 60 years of age, specimen presented by Dr. Nott, of Mobile. The original is black, 
straight, lank, and has a diameter of ,4, of an inch. 
B is a representation of the shape of a hair of the head of his Excellency General 
George Washington; the original is colorless and flowing, and has for its greatest diameter 
xis, and its least, =4, of an inch. 
C is a representation of the shape of a filament of wool of the head of a pure negro; the 
original is black, erisped and frizzled and spira!ly curled, and has for its greatest diameter 
giz, and for its least, 54, of an inch. 
The principal reason why hairs have been misrepresented in regard to shape, is the diffi- 
culty of ascertaining it in the way they have hitherto been examined. A hair is placed 
horizontally between two pieces of glass and examined under the microscope; but it is 
exceedingly difficult, if not. impossible, to determine whether it is cylindrical or oval. 
Even if it is found that the diameters, in different parts, differ, you are at a loss to attribute 
this discrepancy to the shaft being oval or to tapering. But we have a machine with 
