1.0 40øC. ,'• = .02 0.8 ß ß f' • ß • _• 0.6 © pH7.4 ß [] H20, 0.4 P, ' • • • i , , 0 20 40 60 80 ! 100 Cpr w/w % 1-Propanol Conc. Figure 2. Plot of normalized force f' of intact hair fibers against 1-propanol content of immersion liquid at 40øC and extension X = 0.02 f 1.0 0.8 0.6 0.4 60øC. A.=.02 ß [] 0 20 40 60 100 ß pH7.4 ß pH 2.0 80 Cpr w/w % 1-Propanol Conc. Figure 3. Plot of normalized force f' of intact hair fibers against 1-propanol content of immersion liquid at 60øC and extension X = 0.02

l 1.2[ 20oc ' •.=.2 1.0 0.8 0.6 ' I I J i , I 0 20 40 60 ß pH7.4 [] pH 2.0 ! ! ! 80 100 Cpr w/w % 1-Propanol Conc. Figure 4. Plot of normalized force f' of intact hair fibers against 1-propanol content of immersion liquid at 20øC and extension X = 0.2 f' 0.8 40øC, •.=.2 1.0 ß I I I I I 0 20 40 60 0.6 ß pH 7.4 [] pH 2.0 I I 80 100 Cpr w/w % 1-Propanol Conc. Figure 5. Plot of normalized force f' of intact hair fibers against 1-propanol content of immersion liquid at 40øC and extension X = 0.2 (This figure is reproduced with permission of John Wiley & Sons where it origi- nally appeared in the Interpretation of the Mechanical Properties of Wool, Appl. Polym. Symp., 18, 775-94 (1971), byJ. W. S. Hearle, B. M. Chapman and G. S. Seniov.