INDEX. 



Abbreviations used, xvi 

 Annual distribution of lieat, curve of, 

 following in epoch the cor- 

 responding astronomical 

 epoch, 181 

 of temperature, secular ine- 

 quality in the law of the, 

 199 

 Annual fluctuation, apparent inter- 

 ruptions in the regularity 

 of, 183 

 of temperature, discussion 



of, 107, 169 

 of the temperature, irregu- 

 larity in the epoch of the, 

 - 199 



tables of, 180, 194 

 derived from the monthly 



means, 169 

 in concise form, 174 

 Annual fluctuations, table of com- 

 puted, 175, 176, 177, 178, 179 

 Annual maxima, secular variation 



in the, 319 

 Annual means, deviations from the 

 normal temperature, 318 

 plotting of the, 302 

 Annual range in different localities, 

 182 

 magnitude of, depending on, 

 182 

 Annual temperature, range of varia- 

 bility in the secular variation of 

 the, 318, 319, 320 

 Anomaly produced by the Gulf 

 stream's proximity at Key West, 

 112 

 Appalachian Range, l(i5 

 Apparent changes in the curve of the 



annual fluctuation, 194 

 Approximations to the absolute ex- 

 tremes, 202 

 Area of the U. S. conveniently divided 



into two parts, 104 

 Arrangement of tables of mean tem- 

 peratures, xi-xv 

 Arrest of increasing temperature in 



lUay, supposed, 193 

 Atlantic, effect of vicinity of, on yearly 



average, 105 

 Atlantic sea-board, 105 

 Atmospheric disturbances, eastern 



progression of, 193 

 Authorities for geographical positions, 



xi, xii 

 Average of hourly observations equals 



the daily average, 113 

 Average temperature above or below 

 the normal, 320 



Bay of San B'rancisco temperature, 



1U6 

 Bessel's periodic function, 153, 154, 

 169, 194 

 interpolating formula used in 

 preparing a new set of normals, 

 199 

 Bessels, Dr. E., courtesy of, 176 

 Bravais, Mr., formula for correction, 

 173 



California, Gulf of, 105 



western part, 103 

 Cascade Range, 105 

 Cause of extreme heat at Fort Simp- 

 son, 226 

 Changes exhibited in winter as well 

 as in summer, 320 

 from the normal temperature, 



193 

 of temperature observed, 200 

 Characteristic of deviation at Salem, 



193 

 Chart showing meteorological sta- 

 tions, 180 

 Charts, difference of lines adopted, 

 103 

 explanation of, 103 

 total number of results from 

 series plotted on the, 106 

 Chesapeake Bay, high temperature, 



106 

 Climate, increase of meteorological 

 stations, the best means of 

 ascertaining the separate 

 effects on, 104 

 rigor of, 182 

 solar, 104 

 Climatological conditions, 310 

 Cold winter followed by cold sum- 

 mer, 320 

 Coldest and warmest period of day 



in San Francisco, 158, 160 

 Coldest place in the U. S. in summer, 



106 

 Coldest region, where, 105 

 Colorado River, temperature, 106 

 Columbia River, temperature, 106 

 Comparison of the secular variation 

 of the temperature with 

 the variations in the fre- 

 quency of the solar spots, 

 314, 315 

 in the temperature and the 



rain-fall, 315, 316 

 in the temperature with the 

 average annual direction 

 of the wind, 316, 317 



Comparison, process to facilitate, 194 

 series of temperature for the 

 purpose of, 193 

 Connection between the secular va- 

 riation of temperature and rain- 

 fall, 316 

 Constant reduction, 305 

 Correction tables, xiv, xv 

 Corrections, 302, 303, 304, 305 

 required, 169 



to the mean temperature may be 

 derived from hourly observa- 

 tions at Albuquerque, N. M., 

 161, 162 

 Cosmical nature, disturbing influence 



of a, 302 

 Curve of the Gulf stations, 158 



of the middle latitude stations, 

 158 

 Curves for the northern stations, 158 

 smooth, 302 



Daily fluctuation, perceptible even in 

 mid-winter in the Arctic 

 regions, 109 



hourly observations sufli- 

 cient for investigation of, 

 1U9 



small, at Key West, caused 

 by great humidity of the 

 air, 109 



in the Arctic regions in mid- 

 summer, cause of being 

 small, 109 



collection of monthly values 

 for, the results of observa- 

 tions of 18 stations, 110 



collection of monthly values 

 for tables deri ved from, 110 



for stations in the Mississippi 

 -valley, material wanting 

 for, 157 



annual variation in the 

 range of, 157 



annual variation in tlio 

 range of, interjjolation 

 required, 157 



unsatisfactory results in 

 deducing for any given 

 time and place the, 164, 

 165 



combination of tiie results 

 into groups, 154 



great development in Albu- 

 querque, N. M., of, 161 



no material on hand for the 

 study of the effect of 

 height on, 160 



(341) 



