OK, A TREATISE UN I'lLF,. 111 



when the stalk is cut. (See Good's Study of Nature, v. 5, p. 678; Lib. of IM. Know., 

 56, and Bichat's Anat. Genl., v. 2, p. 789, &c., &c.) The most complete summary of 

 Plica Polonica, willjDe found in Diet, des Sci. Med., Paris, 1820, v. 43, p. 226, tit. "fflique," 

 where all that had been previously written upon the subject by fifteen preceding authors, is 

 collected and arranged under appropriate heads. From this compendium it would seem 

 that there are five varieties of this disease, to which man is subject at all ages, and that it 

 has been traced to the lower animals when they are domesticated. That it is not confined 

 to the hair of the head, but extends to all the hair of the body, &c. ; that sometimes it 

 causes the hair to grow to an extraordinary length ; that it makes its appearance more 

 frequently among those persons who are the worst fed, the worst clothed and the worst 

 lodged, and, particularly, if they are uncleanly ; that the seat of the disease is the folli- 

 cle, but that its effects extend to the stalk : that the fluid which exudes is not blood ; that 

 it has been known to attack the bulbs of the hair of shaven heads ; that the matting of the 

 hair is not & felting of 1he filaments but their glutination. This is the pith and marrow of 

 the information. 



A case of incipient Plica Polonica having lately been discovered, in this city, we pro- 

 cured some of the pile, through Prof. John K. Mitchell, M. D. 



Examination of the Hair of Annette Engle, aged, 11, born in Poland of Jewish parents, 

 laboring under incipient Plica Polonica. Length, artificial, I -fa of an inch; shape, gene- 

 rally oval ; mesne diameter, 5 J-- - to ^^ of an inch ; colors, brown and black ; lustre, very 

 feeble. 



With 270 grains one inch stretched -J- r >- of an inch, elasticity entire. 

 " 370 " " " fa 



" 520 " " " -g\ " " 



" 620 ' " " -fa " minus / - 



" 670 " " " ^ " " ^ 



" 87ft " " <' 9 ti 3 



8/U -5-0 -8TT 



" 920 " " " |$ " " ^j- 



" 970 ft " & 



" 1,020 " " ft " " ft 



" 1,070 " " " " " 15- 



" 1,120 " " " ft " " il 



" 1,220 " "- |i < " ft 



" 1,270 " " " ft ft 



V 1,320 " ft . ft 



1,520 2^ 



" 1,770 " " ft " 2| 



" 1,820 " broke. 



Fracture, complicated, the cortex having parted and the fibres being torn out arid 

 lacerated; button, black, sometimes club-shaped, and at others hamate. (See fig. 79 ) 

 Sheath, swollen and extending beyond the button, partly white and opaque, and partly 

 translucent; shaft, varying in color; shape and diameter, for example, one shaft, 

 which is of a brown color and of an imperfect shape, has a diameter of 7 ^, 

 while another, which is black, and of a sub-triangular shape, has a diameter of 

 28 



