ERRATA 
f 
Page 33, footnote 16, drift should read drifts. 
Page 93, line 11, p. 92 should read p. 96. 
Page 239, paragraph 3, line 4, p. 207 should read p. 297. 
Page 267, line 38, p. 298 should read p. 297. 
Page 513, paragraph 6, line 4, 18° F. should read 48° F. 
Page 650, line 15, —18.2° C. should read —18.8° C. 
Page 719, last line, already should read not yet. 
Page 763, line 2 of text, suggest should read suggests. 
Page 819, paragraph 4, last line hydrogenions should read hydrogen-ions. 
Page 916, last line, p. 917 should read p. 973. 
Page 976, last line, ±0.8 per mille should read ±0.03 per mille. 
IV 
