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CHAPTER IV
The Discoveries made by Priestley-Mutual Dependency of Animals
and Plants-The Author's Experiments with Unicellular Algæ—
The Author's Experiments with Convolvulus arvensis and other
Plants, .
Pages 22-24
CHAPTER V.
Attempts to Define the Primitive Conditions of the Globe from the
Results of Modern Research-The Dawn of Animal Life-Effects
of the Gradual Increase of Atmospheric Oxygen;
Pages 25-31
PART II.
THE ATMOSPHERE OF OUR PRESENT PERIOD.
CHAPTER VI.
The Atmosphere is only a Mixture of Gases, not a Compound—
Irrefragable Proof of this by Berzélius-Its Changeable
Composition-The Inert Nature of Nitrogen-Ammonia and
Nitric Acid-The Author's Experiments on their Mutual
Conversion - The Unexplained Phenomenon of "Nitrifica-
tion"-Its Universality-Ammonia, like Carbonic Acid, a
Volcanic Product-Nitrification due to the Oxidation of
Atmospheric Ammonia, .
Pages 32-37
CHAPTER VII.
Definition of the Atmosphere of the Present Day-Transparency-
Spectral Lines of Oxygen not given by the Sun's Atmos-
phere-Observations and Experiments of Janssen, Piazzi-
Smyth, Langley, Dewar, and Faraday,
CHAPTER VIII.
Pages 38-40
Sulphur always present in the Atmosphere-Characin, the Cause of the
Odour of Marshy Air-Odours of the Air in Different Countries-
The Odour of the Sea-Air-Detected by the Author in Marine
Fossils of the Tertiary Period-Odour of the Air after a Summer
Shower-Observations regarding Ozone, . Pages 41-47
CHAPTER IX.
The Electric Phenomena of the Atmosphere-The Author's Researches
and History of Electric Discoveries-Phosphorescence of the Air-
Vibratory Nature of the Lightning-flash,
CHAPTER X.
Pages 48-54
An Unexplained Condition of the Atmosphere-Effects of Glare-
Snow-blindness-Hemeralopia and Amaurosis,
CHAPTER XI.
Pages 55-58
Solid Substances in the Atmosphere which fall to the Earth, or can
be detected in suspension in the Air-The Author's first Discovery
of Iron Particles after the Meteor Stream of November 1866-
Confirmed by other Observers-His detection of Fossil Bacteria
in the Air, and of minute Crystals of Ice-His Observation of
Bundles of Grass transported for hundreds of miles-A Similar
Observation by Boussingault in Venezuela-Presence of Salt and
Sulphate of Soda in the Air-Gossamer-Birds and Insects—
Cosmic Dust-Explosion of Meteors-Periodic Plants-Trans-
portation of Frogs, Stones, Volcanic Ash, etc.-List of Extraneous
Substances-Mode of collecting Bacteria-Observations by
Pasteur, Miguel, and the Author, Pages 59-72
CHAPTER XII.
Air essential to Sound-Mountain Air-Dr. Viault's important Observa-
tion on Hæmatosis-Height of the Atmosphere-Determination of
Altitude-Effects on the Barometer and Thermometer-Tempera-
ture at the Limits of the Atmosphere-Hermite's recent Experi-
ments with small Captive Balloons-Heights of Clouds-
Determination of Water-vapour in the Air-The Rain-band of the
Spectroscope,.
Pages 73-80
CHAPTER XIII.
Air the only Gas that can be breathed-Important Work of the
late Wilson Phipson - The Compressed-air Work of Daniel
Colladon-Dr. Junod's Application of rarefied Air—Air-bath
Establishments-Disinfection-Special Action of given Disin-
fectants-Absence of Microbes in Pure Air,
Pages 81-88
CHAPTER XIV.
Air of Inhabited Districts, of the Country, of the Sea-coast, and of the
Ocean-Quantity of Carbon in the Air of a London Music Hall-
Quantity of Carbon in the Atmosphere of the Earth-Quantity
of Carbon in Organized Beings-The New Gas "Argon"-Forest
Air-The Author's Observations in Waldeck, etc.-The Influence
of Trees on the Air of Towns-Influence of Forests on Rainfall
known to Columbus-The Author's Explanation based on direct
Observation,
Pages 89-95
CHAPTER XV.
Cold Air more dangerous than hot Air-The late Dr. Meisser's
Opinion-Effects of Sojourn in the Tropics-Temperature
Observations-Altitude, Dryness, Humidity-Carbonic Acid
in London Fogs-Air over Stagnant Water-Hydrocarbon
Gases in the Air of certain Localities-The Air of Mines-Air
of Bedrooms-Air of Fermentation-Air of Wells and Sewers-
Air over active Volcanoes-Air of the Mountains-Effects of
Arsenic-Air of Treeless Plains-Air of the Arctic Regions, and
that near the Snow-line on Mountain-slopes-Air of the Tropics—
Air in Cholera Epidemics,
Pages 96-105
CHAPTER XVI.
The Movements of the Atmosphere-Barometer and Thermometer-
Cause of their Reverse Movements-Expansion of Air-Diurnal
Oscillations of the Atmosphere-Fluctuations of the Electric
State of the Air-Velocities of the Wind-Cause of the Move-
ments of the Barometer-English Weather-Cyclones—History
of Rotatory Storms-Small Local Cyclones,.
Pages 106-115
CHAPTER XVII.
Absolute Weight of the Earth's Atmosphere-Various Optical
Phenomena caused by the Air-The greatest height Man has
reached on Foot-The Snow-line and Region of Perpetual
CHAPTER XVIII.
The Formation of Clouds-The Vesicular Theory-The Present
Theory--Cirrus Cloud-Cumulus Cloud-Stratus Cloud-Nimbus
Cloud-Colour of Cloud and Sky as an Indication of coming
Weather-Cause of Electric Phenomena in Thunderstorms-
Formation of Snow and Hoar Frost-Formation of Hail-Curious
Phenomenon of the "Cloud-arch "-First seen in England by
the Author—In Sicily by the poet Goethe-In the Arctic Regions
by Sabine,.
Pages 121-130
.
CHAPTER XIX.
Influence of the Gulf Stream on the State of the Atmosphere over
Europe and the Atlantic-The Curve of Average Temperature and
its Teachings,
Pages 131-134
CHAPTER XX.
Aerolites, or Stones from the Air-"Thunderbolts "-A Stroke of
Lightning-A Fall of Meteoric Stones-Belt of Meteorites round
the Earth-Shooting-star Orbits, and Comets-Old Opinion of the
Indefinite Extension of the Earth's Atmosphere,
CHAPTER XXI.
Pages 135-139
The Organic Matter of the Atmosphere—Effluvia, Miasma, Malaria,
etc.,
CHAPTER XXII.
Pages 140-144
State of the Atmosphere in any given Locality-Immediate Weather-
Table for the British Isles and Northern Europe generally-
Rainfall,
Pages 145-152
CHAPTER XXIII.
Fogs and Electricity-Ronayne's Discovery-Luminous Fogs-
Prevention of Thunderstorms and Hail,
Pages 153-157
APPENDIX A.-Account of an Experiment made with Convolvulus