42 TRICHOLOGIA MAMMALIUM ; 
The diameters of hair fibres have been variously estimated; Henlé found them to be 
tuys; Bidder, yy4z7, and Burns, 5,455. (See Lond. and Edin. Journal of Med., 
1842, p. 702. 
Of the further use of the fibres of Pile—The fibrous arrangement of pile is not only 
well calculated to impart strength to the filament, but to admit of capillary attraction, 
thereby furnishing a passage for such fluids as are not confined to the central canal of a 
perfect hair. It is also well adapted to encircle and protect the canal through which the 
coloring matter of a perfect hair is, when present, conveyed. With a high magnifying 
power, the ends of the fibres may often be seen, when examining transverse sections of 
hair cut so thinly as to be viewed as transparent objects; as in fig 48a, which represents 
the hair of the head of Annette Engle, aged 11 years, born in Poland, of Jewish parents, 
now in Philadelphia, supposed to be laboring under incipient plica polinica. 
Fig. 48 shows the fibres of an American Indian’s hair. A disk of a hair of the Hybrid 
Elen Choate, is seen at fig. «8c; and fig. 48d represents a similar section of the hair of 
the head of the late Mr. Elias Hicks. 
OF THE CENTRAL PORTION OF A Perrect Hair.—This portion of the stalk of a perfect 
hair, exhibits one of the three following appearances :— 
A central canal, containing a granulated substance and pigment cells. 
2. A granulated substance, and no pigment cells. 
3. A void canal. (Henlé.) 
An imperfect hair has no central canal. 
The granulated substance consists of very small, brilliant globules, conglomerated into 
clots; they are oftentimes piled in series upon series; and at others, when less depressed, 
appear in distinct masses, with void spaces between. (Henleé.) 
Fig. 49a represents the hair of one of the oval-haired species, which has been made 
transparent, in order to show the coloring matter in a central canal. 
Fig. 495 is a hair of one of the cylindrical-piled species, which has undergone the 
same operation, but which is not made transparent, because, as it is believed, the coloring 
matter is In the cortex, or in the cortex and fibres. 
Some examples of the disposition of the coloring matter of Pile—One of the most 
interesting studies in regard to pile, consists in the way in which the coloring matter is 
disposed. 
Lhe examination and description of the Hatr of the Dog-Faced Monkey, O. 2.—Quadru- 
mana Tribe, Monkeys of the Old World, (Mandril.)—(Elem. de Zool., 274.)—Specimen 
alive in the Philadelphia Zodlogical Menagerie. Length, 2 inches and ;4;ths; greatest 
diameter, 54, of an inch; least, ;1, of an iver Buta shape conical, with fies largest 
part of the cone towards the postancy extremity of the hair, and very abrupt, or spindle- 
shaped; color, white; length, ;4,; of an inch; diameter, ;4, of an inch. Sheath, invest- 
ing loosely the button and lower extremity of the shaft; color, white, opaque; length, 77> 
of an inch, and diameter, ;1, of an inch. Follicle—had none to examine. Shaft—shape, 
I 
oval; cortex, color, variegated, commencing at the button, dirty-brown,—passing into 
