Index. 
668 
Vacua, On a new Method of obtain- 
ing very perfect, 348. 
Vaughan (Daniel), Volcanic Erup- 
tions, A Theory of, 133. 
Vision, Single and Double, Pheno- 
mena of, 505. 
Vlacq’s Table of Logarithms, On Last- 
Place Errors in, 371. 
Volcanic Eruptions, a Theory of, 133. 
Vortex Motion, 80. 
Walker (Robert), Note of Tempera- 
ture Measurement in the Great 
Geysir of Iceland, August 1874, 
514. 
Wyld (R. S.), Phenomena of Single 
and Double Vision, as shown in the 
Stereoscope, 505. 
Zodiacal Light, Note on, by George 
Forbes, 55. 
ERRATA. 
Page 549, line 23, instead of “Wheatstone’s method (in our refer- 
ence to which Galvanometer is printed Electrometer),” read: “the 
Electrometer method to which we referred.” 
Page 549, line 26, instead of “ Wheatstone,” read: “ this method.” 
Page 550, line 4 from the bottom, After “p. 198” add “Also 
Papers on Electrostatics and Magnetism by Sir William Thomson, 
1872, § 350.” 
Page 555, line 7, after “original liquid,” read : “and that there 
is no special resistance to the passage of the current from the elect- 
rode to the liquid ? ” 
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