316 



SUBJECT INDEX 



oc-/3 transformation, and fibre extension 

 172, 173 



— and the a-helix 1 88 



a-/? transformation, proposals of 

 Ambrose, Huggins, Hanby and Zahn 

 176 



Trichohyalin 97, 226 et seq., 230 



— an a-protein 230 



— fine structure of 226 



— in inner root sheath 100 



— properties of 226 et seq. 



— transformation in to fibrils 100 



(Plate 21), 226 

 Trio groups of hair follicles 76 (Fig. 



33), 78 (Fig. 35) 

 Triturus 51 



Tropocollagen and collagen 127 

 Trypsin, action of on hair follicle 217 

 Tryptic digestion of hair 260 

 Tumours, epidermal 62, 63, 274 

 Tussah silk 180 

 Types of fibrous proteins 5 



— of fibrous texture 124 (Fig. 53) 



— of keratin in feather follicle 106 

 (Fig. 48) 



Tyrosine, as precursor of melanin 280 



— residues in fibroin 180 



Uneven keratinization and its histology 

 272 et seq. 



— and function of tissue 273 

 Unguis and subunguis 68, 273 

 Unoriented a-helices, X-ray pattern 



from 194 

 Urea, action of saturated solution on 

 hair follicle 216 (Fig. 93), 217 



— as solvent for prekeratins 235 



— swelling of follicle by 216 (Fig. 94), 



235 

 Uropygial gland in birds 59 



Variable amino acid composition of 



keratins 31 et seq. 

 — of wool 32 (Fig. 15) 

 Vascular supply to follicle 152, 232 

 Vertebrates, tanning in 27 



Vitamin A, action on hard keratin in rat 

 scales 231 



— up metaplaasia of epidermal trans- 



plants 63 et seq. 



— D 59, 60 



Warts and corns 64, 66 

 Water content of hair bulb 222 

 Wide angle diffraction patterns 11, 

 13 et seq. 



— interpretation of 170 et seq. 

 Wool, amino acids in 7 (Table 1), 9 



(Table 3) 



— fibre follicle and asymmetrical fibre 

 274 (Fig. 114) 



— follicle and crimp 157, 158 (Fig. 



66, 67), 273 



— root extract 237 (Table 14) 

 Work index (30%), definition of 250 



— to stretch wool fibres as function 

 ofpH 253 (Fig. 106) 



Wound " hormones " 149 



X-ray diffraction, and molecular struc- 

 ture of keratins 164 et seq. 



— methods 1 1 (Fig. 3), 24, 165 et seq. 



— patterns, of fibres 13 et seq., 164 



et seq. 



idealized type 13 (Fig. 5) 



of supercontracted fibres 256 



(Fig. 109), 257 



— and chemical reactions 193 



— of bacterial flagella 2 (Fig. 86), 



201 



— of collagen 16 (Fig. 8) 



— of cuticle 265 



— of egg case protein 204 (Plate 3) 



— of feather 16 (Plate 2A), 169, 205 



— of scales, etc. 206 



— oc-type 14 (Fig. 6), 17 (Fig. 9) 



(Plate 1A, 3), 165 et seq. 

 — /9-type 15 (Fig. 7), 18 (Fig. 10), 

 (Plate IB), 205 



— study of hair follicle 214 (Fig. 

 91) 



Xenopus, tail epithelium 87 (Fig. 38), 

 90 et seq. 



Zig-zags, curls and crimps 156 et seq. 



