CONTENTS. 



PA OF. 



INTRODUCTORY LETTER . . . . . v 



PART I. TEMPERATURES. 



Introductory note .... . .1 



General aecount and development of index corrections ... .2 



Record of atmospheric temperatures ........ I 



Investigation of the diurnal variation . . . ... 25 



Investigation of the annual variation . . . . . ... .28 



Influence of wind and snow on the temperature . . .... 33 



Analysis of the recurrence of maxima of cold during winter . . . .35 



Tabulation of hourly corrections for periodic variations . . 38 



Decrease of temperature with elevation .... . .50 



Surface temperature of sea water ......... 50 



PART II. WINDS. 



Introduction .. . . . . . . . . . 55 



Record of the observations of the wind ........ 57 



Method of reduction . . . . . . . . . .74 



Discussion of the resulting direction of the wind . . . . . . .76 



Average force of the winds . . . . . . . 77 



Discussion of the mean velocity of the same . . . . . . .78 



Discussion of the quantity and frequency of the winds . . . .70 



Duration of the winds . ..... 81 



Rotation of the same ........ .81 



Note on miles SI 



PART I II. ATMOSPHERIC PRESSURE. 



Introduction ..... ..... 85 



Comparison of the aneroid and mercurial barometers . . . 80 



Record of hourly observations of the atmospheric pressure . 89 



Discussion of the diurnal variation . . . . . . . .107 



Discussion of the annual variation . . . . . ... .108 



Irregular oscillations, diurnal change, monthly and annual extremes . . . 109 



State of the barometer during gales . . . . . . . .110 



State of the barometer during rain ..... .11(1 



Dependence of atmospheric pressure on the direction of the wind . . . .111 



Comparison of the relative dependence of pressure and temperature on the wind .111 



