176 
IOWA ACADEMY OF SCIENCE Voi.. XXVIII, 1921 
f 
PEATE III. 
18. Typical curve in strong butyl alcohol. Practical absence o£ initial 
relaxation phase, rapid onset of secondary contracture with maintained 
final plateau. 
19. A suggestion of initial relaxation phase in saturated solution of 
butyl alcohol, with maintained horizontal plateau which is slowly rever- 
sible. 
20. 21, 22. Curves resulting on immersion in 1.7, 3.4 and 4.7 vol. per 
cent butyl alcohol, respectively. By a mistake the order in strengths was 
reversed in the labeling. 22 is the strongest (4.7), 20 the weakest (1.7). 
Characteristic in reversible decline. 
23. Typical curve in strong amyl. Note similar contours to those ob- 
tained with propyl and butyl alcohols of equal strength. 
24. Typical curve obtained in saturated solution of amyl alcohol. 
Comparatively similar to equivalent strength of propyl and butyl alcohols! 
25. 26, 27. Curves produced in solutions of 1.1, 0.5 and 0.2 vol. per cent 
amyl alcohol, respectively. Characteristicallyl different from those of 
similar strengths of propyl and butyl, and more closely resembling those 
of weak solution of methyl alcohol (3, 4 and 5). '* 
28. Curve resulting from immersion in secondary octyl alcohol, and in 
sharp contrast to those in strong solutions of its predecessors, propyl, 
butyl and amyl alcohols. Notice an initial relaxation phase whic . 
nowhere else in curves of strong alcohols, and almost as extensive as that 
produced in salt solution (12), in fact, in all its details it is almost a dupli- 
cation of curves produced in salt solution. 
29. Saturated solution of secondary octyl alcohol. It contrasts sharply 
with curves obtained from similar concentrations of propyl, butyl and 
amyl alcohols, and its nearest simile is that produced by comparable 
strength of ethyl alcohol (8). 
30. 31 and 32. Curves of secondary octyl alcohol of weak strengths, 
0.62, 0.29 and 0.15 vol. per cent, respectively. These, as can readily be 
seen, are easily comparable to those obtained from similar strengths of 
butyl, and to a less degree of propyl alcohols. 
