Q19 



Explanation op Plates ili.ustrative of Dh. In man's Paper on the 

 Natural History and Microscopic Character of Hairs. 



Plate II. 

 Fig. 1. — Plan of human hair, p. 86. 

 a. Natural scaly appearance, p. 87. 



h. Scales projecting after immersion in strong sulphuric acid — dividing 

 these, the medulla is seen to be composed of a single row of 

 cells. 



c. Section of straight hair from head, p. 86. 



d. Section of curly hair from head. 



Fig. 2. — Plan of hair below the surface of the skin. 

 The scaly coAting is seen to terminate in a sort of collar. This is where 

 the epidermis is reflected from the sheath on to the hair; below 

 this is seen, on our left hand, the usual appearance presented by a 

 grey hair. It will be noticed that the fibres are formed between 

 the cells, and not by any change of the cells. In the centre is 

 seen the medulla or pith — its cells diminish in size as they 

 advance. On our right is the usual appearance presented by a 

 brown or black hair. The fibres are not shown on this side — the 

 pigment granules are shown to be formed exterior to the cells, 

 p. 99, 100. 

 Fig. 3. — The epidermic sheath which terminates in what has been 

 called the fibrous sheath. A distinct epithelium may be traced con- 

 tinuously from the skin, and to be reflected on to the hair, p. 98. 



Fig. 4. — Represents a hair infested by vegetable parasites. 2 — repre- 

 sents the usual appearance in confirmed tinea. 1 — the spores more 

 distinctly marked. At this time nothing but the spores can be seen, 

 p. 107. 



Fig. 5. — Represents the appearance of a hair when the disease is 

 stationary. 1 — shows the branches from the spores growing in the hair, 

 2 — is a transverse section of the same hair. 



Plate III. 



Fig. 0. — Plan of hair follicle — to show the continuity of the different 

 parts with the different layers of the skin, p. 96-7-8. 



Fig. 7. — Hair from a.xilla broken up into fibres, p. P8. 



Fig. 8. — Hair of two-toed sloth, p. 94. 1 — longitudinal : -2 — tmiis- 

 verse. 



