206 
the passage of fluids, by the use of 
flexible substances, 171. 
Vegetation, on the effects of salt on, 114. 
Verneuil (M. E. de) on the geological 
structure of Spain, to explain an out- 
line general map of the Peninsula, 108. 
Vibrio that attacks grasses, on a, 124. 
Vidua' paradisea, on a peculiar structure 
in the submedial pair of rectrices of, 
126. 
Vision, on the powers of minute, 183. 
Voelcker (Dr. A.) on the proportion of 
phosphoric acid in some natural waters, 
63; on the per-centage of nitrogen as 
an index to the nutritive value of food, 
64; on the effects of salt on vegetation, 
114, 
Volcanic phzenomena, on the causes of, 
88. 
Voltaic arc, on a peculiar form produced 
in a diamond when under the influence 
of the, 53. 
Ward (W. Sykes) on a gas stove, 191. 
Water, on the action of the soap-test 
upon, containing a salt of magnesia 
- only, and likewise upon water contain- 
ing a salt of magnesia and a salt of 
lime, 49 ; on the proportion of phos- 
phoric acid in some natural, 63 ; on the 
extent to which fluoride of calcium is 
soluble in, at 60° F., 68. 
Water-dread, analysis of the phenomena 
of, 129. 
Water sirene, on the, 174. 
Waves, 23; magnitude, velocity and phe- 
nomena of the Atlantic, 26; on the 
force of the, 189. 
INDEX II. 
Wells (T. Spencer) on the climate of the } 
valley of the Nile, 45. 
Westmoreland, on striated and polished 
rocksand “ Roches Moutonnées” inthe 
lake district of, 76. 
Whincopp (Mr.),a collection of bones and 
teeth of mammalia and fishes, &c., pre- 
sented by, 192. 
Williamson (Prof. A. W.), results of a 
research on ztherification, 65. 
Wilson (Daniel) on the evidence of the 
existence of primitive races in Scotland 
prior to the Celta, 142. 
Wilson (Dr. George) on the influence of 
sunlight over the action of the dry 
gases cn organic colours, 65; on the 
presence of fluorine in blood and milk, 
67 ; on the extent to which fluoride of 
calcium is soluble in water at 60° F., 
68 ; afew unpublished particulars con- 
cerning the late Dr. Black, 69. 
Wolley (J.) on the birds of the Faroé is- 
lands, 127. 
Woman, on the causes which advance or 
retard the appearance of the first men- 
struation in, 135. 
Wood (Dr. A.) on the laws regulating 
the development of monstrosities, with 
illustrative specimens, 138. 
Yorkshire, on isoclinal magnetic lines in, 
14. 
Ystalyfera, on the advantageous use made 
of the gaseous escape from the blast 
furnaces at, 172. 
Zaglas (M.) on the morphology of the 
muscular system, 138. 
THE END. 
LONDON: 
PRINTED BY RICHARD TAYLOR, 
RED LION COURT, FLEET STREET. 
FLAMMAM. 
