XXII. 
CONTENTS. 
hi their formation and propulsion.—Peculiar kind of force exerted 
by the sea.—“ Tin pebbles” in accumulations of river pebbles and 
gravel.—Pasage of the river Lyd at the bridge.—“ Degradation of 
land.”—Estimate of recent agencies ;—ferruginous and other con¬ 
glomerates, &c.—Peat.—China clay.—Disintegrating trapp.—Dis¬ 
integrating and decomposing slates.—Coincidence in respect of 
fossils.—Magnetic iron-stone.—Meteorolite.—Petrifying spring.— 
“ Weathering” of rocks, ... Page 106 to 142. 
Chapter IV.— Rivers, Lakes, and Springs. —The South of Devon 
remarkable for its number of rivers and streams ; their rise.—Rain, 
dews, &c. affect their currents greatly.—Our hills, their importance 
as attractors of clouds, &c.—Springs, their frequency in the slate dis¬ 
tricts, and rarity in the limestone tracts.—“ Hot and cold springs.”— 
Lakes of South Devon.—Upland vallies.—Craumere Pool describ¬ 
ed.—Bovey Heathfield, its height as regards the sea.—Slapton Ley 
described.—Analysis of “ Victoria Spa” water. - Page 143 to 150. 
Chapter V. —Climate and Blight. —Climate, general character 
of,—humid and uniform in heat;—causes influencing these 
conditions;—proofs of its general mildness and genial effects derived 
from plants, birds, and insects.—Dartmoor, climate of.—Extremes 
of heat and cold not considerable.—Commencement of the winter’s 
cold.—Summers, character of our.—Springs, character of the.— 
Autumns, character of the.—Prevailing character of each month in 
the average of years.—Supposed alteration in our seasons.—Blight, 
common causes of with us,—south-west winds,—electric influences,— 
east winds,—sputh-east winds,—insect blights generated by 
electricity,—other insect blights, (caterpillars, “ fern webs,” “ oak 
webs,” aphides);—partial blights.—Late frosts,—susceptibility of 
vallies to.—Orchards, sites suited for.—Dry May, disasters 
attendant on.—Destructive insects, (red ant, cabbage butterfly, 
aphis, “ black army,” “ American bug,” “ wire worm,” &c.)— 
Effects of the climate on the growth of timber, &c.—Wet summers, 
consequences of.—Power of electricity in the production of blight.— 
Table shewing the difference of temperature in the various months 
at a situation on the borders of the Moor, and at a spot on the coast; 
illustrating also a remarkable uniformity in the mean annual heat 
in the latter case.—Effects of our climate on the health,—prevailing 
ailments,—low sites, then* productiveness of Typhus Fever,— 
probable reasons of this,—“colds” their origin,—Scrofula.—East 
Avinds in winter, phenomena attendant on.—Refraction, cases of.— 
Westerly winds, their blighting effects.—Disposition to sudden 
changes in the wind whereby extremes of temperature are greatly 
obviated.—Storms, uses of.— Thunder storms.—South-Avest gales 
blighting.—Floods, uses of.—Snow, uses of.—Thaw, nature of. — 
Terrestrial exhalations.—Fogs, or floating vapour from the sea. — 
Ice, results of its formation.—Grasses, their resistance to great cold 
andheat.—Instanceof the earth conducting sound.—Exemplification 
of the poAvcr and prevalence of south-west winds. — Omen of an 
approaching storm.—Cases of severe southwest gales. — Carrington 
cited. ----- Page 151 to 190. 
