CONTENTS. 



PAGE 



Wood-cuts : Diagrams C and D, showing the average daily range for each month, for five 



groups distributed between the Arctic Regions and the Gulf of Mexico . . .157 



Wood-cuts: Diagrams E, F, and G, showing the daily variation of temperature in June and 



December for Arctic stations, Temperate latitude stations, and Gulf stations, respectively 160 



SECTION III. 



List of Observeks 

 Index . 



169 

 115 



The annual fluctuation of the temperature expressed in terms of a periodic function . 



Table of computed annual fluctuation of the temperature at 46 stations 



Discussion of the results for dates of mean annual values, and for maxima and minima; and 



annual range in connection with the geographical distribution of the stations 

 Examination into alleged interruption in the regularity of the annual fluctuation at certain 



epochs, with tables of temperature of each day of the year, deduced from a series of years 

 Investigation of the variability of the temperature of any one day in a series of years 

 Inequality in the epoch of the minima and maxima of the annual fluctuation . 

 Tables of observed extremes of temperatures, arranged by months, for a selected number of 



stations ........... 



Analysis of tabular results for greatest heat and greatest cold with regard to geographical 



distribution ........... 



Extreme annual range of temperature and monthly absolute variability, exhibition of the law 



of annual distribution ......... 



Tables of the mean annual temperature, principally in the United States, for a succession of 



years, from the earliest records to the close of the year 1870 .... 



Investigation of the secular variation of the annual mean temperature, and of the permanency 



of the climate . . 



Comparison of the secular variation of the temperature with the variations in the frequency of 



the solar-spots .......... 



Comparison of the secular variation in the temperature aud rain-fall in the United States 

 Comparison of the secular variation in the temperature with the average annual direction of 



the wind ........... 



Range of variability in the secular variation of the annual temperature 



Secular variation in the annual minima and maxima, compared with the variation in the annual 



means ........... 319 



Illustrations to' Section III. 



Wood-cut of North America, showing position of stations especially selected for character and 



distribution of the annual fluctuation ....... 180 



Plate illustrating the irregularity throughout the year of the daily mean temperature for five 



stations, selected on account of length of series of observations; to face . . 193 



Plate exhibiting the character of the secular variation in the mean annual temperature, for a 



number of stations, and comparison of variations in temperature and the solar-spots ; to face 310 

 Cut, showing two typical curves of comparison of the secular variation in the temperature and 



the rain-fall .......... 



Cut, illustrating the relation of the secular variation in temperature and direction of wind for 



Brunswick, Me., and Marietta, Ohio ...... 



List of Stations ......... 



180 



183 

 197 

 199 



202 



226 



227 



228 



302 



314 

 315 



316 



318 



16 



317 

 321 

 333 

 341 



