The chief commercial use of the rabbit’s hair, which is usually about half an inch in length, is the manufacture of linings for hats.
The hair of the cat has a superficial resemblance to that of the thinner hairs of the rabbit. The medullary canal is very prominent, and occupies more than half of the fibre. It is made up of a single series of quadrilateral cells, but unlike the cells in rabbit’s hair, these may form additional layers in the thicker parts of the hair. The hair is generally a little over half an inch in length, and tapers to a fine point.
 |  | |
| (IRISH WETHER) | (QUEENSLAND SHEEP) | |
 |  | |
| (NEW ZEALAND) | (LINCOLN WETHER) | |
 |  | |
| (NORTH HOG) | (ARGENTINE CROSS BREED) |
WOOL FIBRES
From different breeds of Sheep
By kind permission of Messrs. Scott Greenwood & Co.
Dog’s hair differs from the hair of the cat both in size and appearance. It is about three times as wide, while the medullary canal only occupies about one quarter of the diameter of the fibre. The surface of the hair is covered with characteristic scales, the edges of which project, so that the edge of the fibre has a saw-like appearance.
The accompanying plate shows hair taken from a Pekin spaniel and Persian kitten, and drawn to the same scale of magnification (104 diameters).
In the hair of the kangaroo the serrated edge of the fibres, due to projecting scales, is much more pronounced than in dog’s hair. The medulla is well marked, but lacks the cellular structure to be seen in the hair of the cat and rabbit.
Goat’s hair could not possibly be mistaken for human hair under the microscope. It has a root of characteristic appearance, and shows a well-marked medulla containing a structure of narrow cells.