However, when we place these hairs under a microscope we find that animal hairs vary from human hairs in many different aspects.
One, the medullary structure. In animal hair the medullary structure is much wider than that in a human hair. You will find that it exceeds more than one-third of the width of the hair shaft.
Secondly, the shape of the medulla, as in this rabbit hair, varies greatly. You can see the individual medullary cells very distinctly. In this chart I have some photographs of human hairs in which a medulla is not present. But the medulla in a human hair would look just about like this, very thin.
We move down to the pigmentation of the hair, which is located in the cortex. In the human hair the pigmentation is very fine and granular, and in this animal hair it is very coarse and elongated.
The size and shape of a root on the animal hair differs from the size and shape of the root in the human hair. Here we see the root of a dog hair which is very long and very thin. The root of a human hair is more or less shaped similar to a light bulb. The scales of animal hairs are very large. The scales of the human hairs are much smaller.
Mr. Eisenberg. Mr. Chairman, may I have this chart which the witness has been using introduced as 667?
The Chairman. It may be admitted.
(The chart referred to was marked Commission Exhibit No. 667, and received in evidence.)
Mr. Eisenberg. You are looking at a new chart called "Racial Determination of Hairs" with the subcaption "General Appearance of Shaft"?
Mr. Stombaugh. That is correct.