46 TRICHOLOGIA MAMMALIUM; 
successively more and more complicated—sometimes by metamorphoses, and at others 
without them. Having arrived at complete development, the period of decline commences; 
for there 1s nothing stationary in their existence. ‘There appears to be three distinct 
varieties of hair of the head of man, referable to three as distinct periods of production, 
VIZ — 
Ist. The primitive hair, spoken of by Valentin and Bichat, as above quoted. These 
fall off, mixing with the envelope of the foetus, and are never found except in the meco- 
nium.* We have never been able to obtain any of these hairs. 
2d. The transitive variety, which succeeds to the primitive, and which is found upon 
the newly-born infant; but which generally falls out a few weeks after birth. 
3d. The permanent hair; if permanent may be called hairs which are being continually 
renewed during life. 
4th. The hairs of puberty. 
It would be very interesting to ascertain whether the three first varieties are not pro- 
gressive in the order of their perfection of organization, as they are in their order of time 
of production. In order to determine this question, we have made several unsuccessful 
exertions to obtain the pile of the first variety. With regard to the second, we think that 
we have shown that it is less perfect than the third. (See title Follicle.) 
Or AcctpENTAL Hairs.—Hair is, occasionally, developed im unusual places, as in the 
cystis of ovaries—on moles—on navi materni—on freckles—on the mucous membrane of 
the conjunctiva—on the intestines—on the gall bladder—in the stomach—on steatomatous 
and encysted tumors—on tlie tongue and in the uterus. 
Homer talks of the hazry heart of Achilles, and Pliny speaks of hair upon the heart, but 
we have never witnessed any such phenomenon. Dr. Gross says that hair can be pro- 
duced in unusual places by constant friction. (Elem. of Phys. and Anat.,p. 330.) (Sed 
quere ’) 
Of the Hair found in Ovaries——Among hairs that are denominated “accidental,” 
because they are found occasionally, only, being developed in unusual places, the most 
remarkable are those discovered in the cystis of ovaries. Bichat gives the following 
account of these anomalies :— 
“A sack, sufficiently voluminous, contained a multitude of very distinct little balls, 
resembling the excrement of sheep; they were formed of a white, greasy, unctuous sub- 
stance, very different in aspect from common grease. On the internal surface of each of 
these were planted a great many hairs, which the least movement was sufficient to 
displace. The hair was black.” He also found some hairs, entirely detached, which 
were interlaced in various degrees of compactness in little balls. (Anat. Genl., v. 2, 
p. 799.) + 
* Excrement noir et epais amassé dans les iutestins d'un eniant naissant. 
+ For ovary hairs see Meckl. Memoire sur les poils et les dents qui se develop accidentellement dans le corps. (See Jour. 
Compl. au Dict. des Sci. Med., y. 4, pp. 122 and 217.) Also Bricheteax Obsr. de Kystes dermoides et pileus, &c. (Jour. 
Compl. des Sci. Med., v. 15, p.298.) Hairs have been found in the testicles. (Meckl.) 
