Chapter I: Front Matter

SHILLING SCIENTIFIC SERIES

R is the test-receiver; P the air-pump; M the measuring apparatus; L the illuminating arrangements; G the Gasometer; A the pipe through which the tested air is drawn.]

METEOROLOGY;
OR,
WEATHER EXPLAINED.

BY
J. G. M'PHERSON, Ph.D., F.R.S.E.,

GRADUATE WITH FIRST-CLASS HONOURS, AND FOR NINE YEARS
EXTENSION LECTURER ON METEOROLOGY AND MATHEMATICAL
EXAMINER IN THE UNIVERSITY OF ST. ANDREWS;
AUTHOR OF "TALES OF SCIENCE," ETC.

LONDON: T. C. & E. C. JACK,
34 HENRIETTA STREET, W.C.
AND EDINBURGH.
1905.

THE SHILLING SCIENTIFIC SERIES

_The following Vols. are now ready or in the Press_:--

BALLOONS, AIRSHIPS, AND FLYING MACHINES. By GERTRUDE BACON.

MOTORS AND MOTORING. By Professor HARRY SPOONER.

RADIUM. By Dr. HAMPSON.

TELEGRAPHY WITH AND WITHOUT WIRES. By W. J. WHITE.

ELECTRIC LIGHTING. By S. F. WALKER, R.N., M.I.E.E.

LOCAL GOVERNMENT. By PERCY ASHLEY, M.A.

_Others in Preparation_

Printed by BALLANTYNE, HANSON & CO.
At the Ballantyne Press

CONTENTS

CHAP. PAGE

I. INTRODUCTION 9

II. THE FORMATION OF DEW 13

III. TRUE AND FALSE DEW 17

IV. HOAR-FROST 20

V. FOG 23

VI. THE NUMBERING OF THE DUST 26

VII. DUST AND ATMOSPHERIC PHENOMENA 29

VIII. A FOG-COUNTER 31

IX. FORMATION OF CLOUDS 34

X. DECAY OF CLOUDS 37

XI. IT ALWAYS RAINS 40

XII. HAZE 43

XIII. HAZING EFFECTS OF ATMOSPHERIC DUST 47

XIV. THUNDER CLEARS THE AIR 49

XV. DISEASE GERMS IN THE AIR 53

XVI. A CHANGE OF AIR 55

XVII. THE OLD MOON IN THE NEW MOON'S ARMS 58

XVIII. AN AUTUMN AFTERGLOW 62

XIX. A WINTER FOREGLOW 65

XX. THE RAINBOW 68

XXI. THE AURORA BOREALIS 71

XXII. THE BLUE SKY 74

XXIII. A SANITARY DETECTIVE 78

XXIV. FOG AND SMOKE 80

XXV. ELECTRICAL DEPOSITION OF SMOKE 83

XXVI. RADIATION FROM SNOW 86

XXVII. MOUNTAIN GIANTS 88

XXVIII. THE WIND 92

XXIX. CYCLONES AND ANTI-CYCLONES 95

XXX. RAIN PHENOMENA 98

XXXI. THE METEOROLOGY OF BEN NEVIS 102

XXXII. THE WEATHER AND INFLUENZA 107

XXXIII. CLIMATE 110

XXXIV. THE "CHALLENGER" WEATHER REPORTS 114

XXXV. WEATHER-FORECASTING 116

INDEX 124

PREFATORY NOTE

I am very much indebted to Dr. John Aitken, F.R.S., for his great kindness in carefully revising the proof sheets, and giving me most valuable suggestions. This is a sufficient guarantee that accuracy has not been sacrificed to popular explanation.

J. G. M'P.

RUTHVEN MANSE,
_June 10, 1905_.

METEOROLOGY