INDEX II. 
Disease, on the geographical distribution 
of, as indicating the connexion between 
natural phenomena and health and 
longevity, 150. 
Dome for observatories, on a folding, 
180. 
Donaldson (Professor) on the water si- 
rene, 174. 
Door spring, on an improved, 170. 
Doris, on the anatomy of, 124. 
Dorsetshire purbecks, on the succession 
of strata and distribution of organic 
remains in the, 79. 
Dracena Draco, on the treatment and 
flowering of a plant of, 114. 
Drainage, on the gradual subsidence of 
a portion of the surface of Chat Moss, 
in Lancashire, by, 101. 
Drosera, on the epidermal appendages of 
the genus, 113. 
Dumfries-shire, on the position of the 
footsteps in the Bunter sandstone of, 
83 ; on the representatives of the moun- 
tain limestone as they occur-in, 84. 
Dura Den, on the fossil fishes and yellow 
sandstone of, 70. . 
Dynactinometer, on a new instrument 
called the, for comparing the power 
of object-glasses, and for measuring 
the intensity of the photogenic light, 
12. 
Earth, on the structure of the lunar sur- 
face, and its relation to that of the, 25; 
on the conductibility of the, 56. 
Earth’s surface, on the erosions of the, 
85. 
Earthquakes in 5. America from 1844-47, 
on, 82. 
Echinus, on the European species of, and 
the peculiarities of their distribution, 
123. 
Edinburgh, on the effects produced by 
lightning on a tree near, 13; account 
of the observatory at, 31; on the gla- 
cial phenomena of the neighbourhood 
of, 78. 
Edmonds (Richard, jun. ), remarkable 
thermometrical maxima at or near the 
muon’s first quarter during the twelve 
years 1839-50, 32. . 
Electrical appearances observed at Man- 
chester on July 16, 1850, 31. 
Electricity, 3; onthe application of, and 
heat as moving powers, 183; on the 
dynamic equivalent of current, 185. 
Embleton (Dr.) on the anatomy of Do- 
Tis, 124. 
Equatorial mounting for the. Edinburgh j 
Furnaces, blast, at Ystalyfera, on the ad- 
observatory, on a new form of, 187. 
199 
Estates, statistics respecting the sale of 
encumbered, in Ireland, 148. 
Ethnology, 140. 
Exuvie of crustacea, on shedding the, 
115. 
Eye, on the polarizing structure of the, 5. 
Eye-piece, on a new solid, 15. 
Fairbairn (William) on a wrought iron 
tubular crane, designed by, 177. 
Faroé islands, on the birds of the, 127. 
Finch (Dr. Cuthbert) on the prevalence 
and mortality of cholera in the Indian 
armies, 161. 
Fishes, fossil, of Dura Den, on the, 70; 
presentation by Mr. Whincopp of a 
collection of the bones and teethof, 192. 
Flints, chalk, from the boulder clay in 
Caithness, 93. 
Fluids, on some proposed improvements 
in valves, stopcocks or stoppers for 
regulating the passage of, by the use 
of flexible substances, 171. 
Fluorine, on the presence of, in blood 
and milk, 67. 
Food, on the per-centage of nitrogen 
as an index to the nutritive value of, 
64. 
Forbes (James D.) on the alleged evidence 
for a physical connexion between stars 
forming binary or multiple groups, 
deduced from the doctrine of chances, 
23. 
Forbes (Prof. Edward) on the succession 
of strata and distribution of organic re- 
mains in the Dorsetshire purbecks, 79; 
on the European species of Echinus, 
and the peculiarities of their distribu- 
tion, 123. 
Forces, on the reciprocal relation of the 
vital and physical, 133. 
Forfarshire, on some phenomena of mi- 
rage on the east coast of, 42. 
Fossiliferous deposit underlying basalt in 
the island of Mull, on the, 70. 
Fossil specimens from the boulder clay, 
on, 93. 
Fossils, oolitic, from the boulder clay in 
Caithness, 93; palozoic, in the cry- 
stalline chain of the Forez in France, 96. 
Fowler (Dr. R.) on the influences of 
man’s instinct on his intellectual and 
moral powers, 130. 
France, on the six climates of, 46. 
France and Germany, on lines of disloca- 
tion between the lower and upper car- 
boniferous deposits of, 96. 
Fringes of interference, on a fictitious dis- 
‘placement of, 20. 
