INDEX. 



343 



Isothermal of 440 depending on tlie 

 directions of tlie Rocky Moun- 

 tains, the Cascade range and 

 the Sierra Nevada, 105 



of 520 depending on the direction 

 of the Appalachian range, 105 

 Isothermals, curve cannot abruptly 

 come to an end, 103 



curves for the yearly distribution 

 more troublesome than tliose 

 for either of the other charts, 

 103 



curves referring to the yearly 

 period, 104 



not reduced to the sea-level, and 

 reason why, 104 



Joaquin valley temperature, 106 



Law of the annual distribution of 

 temperature, secular inequality in 

 the, 199 

 Least annual extreme range, 227 

 Length of normal month, 169 

 Lewis, Dr. James, inventor of ther- 



mogi-aph, 110 

 Local variation of annual means, 302 



Magnitude of the monthly correc- 

 tions, 170 

 Maxima and minima thermometers, 



■202 

 Maximum temperature, dates for the, 



181 

 Maximum variability in summer, 163 



in winter, 163 

 Mean annual temperature applied to 

 measure the rigor of 

 climate, 182 

 object of tabulation of, 228 

 tables of, 228-301 

 Mean annual temperatures, explana- 

 tion of tables of, 228, 229 

 tables of consolidated, 312, 

 313 

 Mean daily temperature subject to 

 less variations with respect to lati- 

 tude than the daily extremes, 157 

 Mean length of February, 169 



of the year, 169 

 Mean temperature, character of secu- 

 lar variation in, 310, 311 

 for each year, 302 

 for the montli of normal 

 length, to compute, 169, 

 170 

 Mr. E. L. de Forest's method 



of finding the, 170 

 of every day derived from 

 Bessel's periodic func- 

 tion for New Haven, 

 Connecticut, 196 

 for Toronto, Canada, 195 

 of the year, correction to 

 the, 171, 172 

 epoch when reached, 180 

 tables of, for each month, 

 season, and the year at 

 various stations, princi- 

 pally in North America, 

 1-99 

 Mean temperatures, explanations and 

 remarks on the consolidated tables 

 of, xi-xv 

 Mean value of the year, epochs of, 181 

 Mean values applicable to most 

 localities in the U. S., between 

 latitudes 30° and 4.'iO, and east of 

 the Mississippi, 112 



Measure of irregularities, 197 

 Meridian, 100th, 104 

 Meteorological observations at Wil- 

 liamstown, results com- 

 municated to Secretary 

 Calhoun, 110 

 difference of results obtained 

 when taken at different 

 hours, 110 

 ho'urs adopted at the mili- 

 tary posts of the U. S. for, 

 111 

 hours adopted by the Royal 



Society for, 111 

 hours adopted by the Smith- 

 sonian Institution and U. 

 S. Patent Office for, 111 

 improvement on hours for, 



111 

 system established by the 

 Surgeon-Greneral of the 

 U. S., Ill 

 time changed, but re-estab- 

 lished at the military 

 posts of the U. S., Ill 

 Meteorological Society, Manheim, 



Germany, hours adopted by, 110 

 Meteorological stations, increase of, 

 best means of ascertaining the 

 separate eifects on the climate, 

 104 

 Method of ascertaining the irregular 



variations of temperature, 162 

 Midsummer extreme, 181 

 Midwinter extreme, 181 

 Minima, secular variation in the 



annual, 319 

 Minimum and maximum range of 

 temperature in Sau Francisco, 

 158 

 Minimum temperatures, dates for the, 



181 

 Minnesota, cold region, 105 

 Mississippi, stations east of the, 104 



stations west of the, 104 

 Monthly, absolute, range, 227 



and annual extremes, discussiou 



of, 167, 169 

 correction, regular progression 



of, 171 

 means of the range of the daily 

 fluctuation, 157 



Normals, new set of, prepared, 199 



Normals of temperature made out by 

 General Sabine, 194 



North Carolina, 105 



November, rapid decline of tempera- 

 ture in, 193 



Observations, times of, xii, xiii 



Pacific coast, great uniformity of the 

 distribution of temperature along, 

 105 

 Pacific Ocean, direct influence of, on 

 climate of the Western 

 States, 105 

 influence lieightened by 

 presence of cool current 

 running south, 105 

 Period of irregularity, 193 

 Periods of apparent interruptions in 

 the regularity of annual fluc- 

 tuations, 183 

 of irregularities of difi'erent series 

 examined, 193 

 Permanent change of climate not 

 perceivable, 311 



Probable error of an observed tem- 

 perature at any hour of 

 the day, 164 

 of the monthly mean tem- 

 perature for any hour of 

 the day at various places, 

 163 

 Probable variability of the monthly 

 means of temperature, Toronto, 

 Canada, 162, 163 

 Progression of unusual thermal dis- 

 turbance, eastern, 193 



Radiation, decreasing, 181 

 Rain-fall, 317 



comparison of the secular varia- 

 tion in the temperature and 

 the, 315, 316 

 remained permanent in amount 



and distribution, 311 

 secular variation, in the, 315 

 Rainy season in Florida, 105 

 Rapid rise of temperature in Febru- 

 ary, 193 

 Ratio between the fluctuation of the 

 mean temperature of any day in 

 midwinter and midsummer, 198 

 Ratio of the highest to the lowest 

 range within the limits of the 

 United States, 227 

 Red Lake, Minnesota, low elevations, 



105 

 Reduction, no precise data for such, 



104 

 Regularity of annual fluctuation ap- 

 parently interrupted, 183 

 Regularity of progression of the tabu- 

 lar numbers for Mohawk, 164 

 Regular progression in the yearly 

 period of the monthly absolnte 

 range, 228 

 Remarkably cold epoch, 311 

 Remarks and explanations on the 

 consolidated tables of resulting 

 mean temperatures, xi-xv 

 Requirements of investigations of the 

 apparent interruptions in the 

 regularity of annual fluctua- 

 tions, 183 

 fluctuation, tables of, 195, 196,197 

 Result of examination into the sus- 

 pected periods of irregularity, 193 

 Results, combination of, 302 



of examination, if the epoch of 

 maximum annual heat is ac- 

 companied by a corresponding 

 movement, 201 

 of tables from the basis of the 

 charts, 103 

 Rocky Mountains, 105, 106 

 Rules for complete quadriennia, 169 



Sacramento valley temperature, 106 

 Secular inequality in the law of the 

 annual distribution of temperature, 

 199 

 Secular variation in the annual 

 maxima and minima 

 compared with the varia- 

 tion in the annual means, 

 319 

 in mean temperature, 310 

 in the temperature, 317 

 investigation of, 302-320 

 of temperature, discussion 



of, 167, 169 

 of temperature, stations 

 selected for investigation 

 of, 302 



