A 



B 



Plate 20 



A. Cross-section of edge of hair cuticle and the inner-root sheath of a 

 human hair in the hair follicle. Same level as Plate 14A. Sections of three 

 cuticle cells {Cu 1, 2 and 3) appear in the upper half and within each cell 

 may be distinguished the cytoplasmic material largely particulate, and 

 the lumps of amorphous keratin, K, which are packing against the outer 

 membrane, M, limiting each cell. Outside the cuticle (lower half of picture) 

 may be seen the cuticle of the inner root sheath Cs and a Huxley-layer 

 cell Hit. In each of these may be seen sections of granular trichohyalin, 

 H, and transformed material, T (fibres seen in longitudinal section, see 

 Plate 20B). 



B. Higher magnification of the transformed trichohyalin (T of 20A). 

 There seem to be here sections of filaments and of ribbons (or coalesced 

 filaments). 



