342 



INDEX. 



Daily range of tumperature at San 

 Francisco, 158 

 cause of diminishing of, from 

 latitude 40O Ui either di- 

 rection, north or south, 

 156 

 diminishing from latitude 

 40O in eitlier direction, 

 north or south, 156 

 minimum iu Decemher, 158 

 Daily variation, dryness of the air, 

 cause, at Albuquerque, 

 valley of the Rio Grande, 

 of the excessive, 109 

 Dakota, northeastern, 105 

 De Forest, table in connection with 

 the use of the periodic function, 

 173 

 Departure of the observed tempera- 

 ture from the normal value of that 

 day, 197 

 Departures from regularity of tem- 

 perature, 193 

 Depression of temperature, unusual, 



in May, 193 

 Deviation from the regular annual 

 progression, 193 

 limit of, at Providence, R. I., 199 

 Diagram illustrating the relation of 

 the secular variation iu tempera- 

 ture and direction of wind, 317 

 Diagram showing the connection 

 between the secular variation in 

 temperature and rain-fall, 316 

 Difference in the mean monthly tem- 

 perature, correction required, 169 

 Difference of mean values in the 



winter season, 193 

 Difference of temperature for a few 

 selected places in New Mexico, 

 Texas, Arizona, and California, at 

 certain hours, 161 

 Differences, application of tables of 

 hourly, 110 

 benefit derived from tables of 



hourly, 110 

 of bi-hourly, hourly, and semi- 

 hourly mean temperatures 

 from the mean of the day, 

 tables of, 137-152 

 signs employed in the tables of, 

 111 

 Different methods of exhibiting the 

 anuual fluctuation of the teiiipera- 

 , ture, 169 

 Diurnal fluctuations, systematic 



comparison, 153 

 Dryness of air at elevated regions, 

 and consequence thereof, 160 



Eastern progression of atmospheric 

 disturbances, 193 

 tendency of the normal state of 

 weather, 193 

 Effect of Gulf stream, 105 

 Elevation, effect of, on temperature, 



104 

 Epoch of the annual fluctuation of the 

 temperature, irregularity in 

 the, 199 

 of occurrence of annual mean 

 temperature shifting in 

 different longitudes, 182 

 cause of shifting, 182 

 presenting fair estimate of 

 annual mean temperature 

 of a place, 182 

 Equinox, 181 



Error in computing time tables of 

 sunrise and sunset, caused by the 

 small variation in the sun's decli- 

 nation, of little moment, 113 

 Examination of the larger series of 

 places in the United States desira- 

 ble, 200 

 Exceptionally depressed heat in Janu- 

 ary, 226 

 Exceptionally warm period, 311 

 Excess of exceptionally high tem- 

 peratures, 226 

 Excessive large daily range notice- 

 able in the great interior basin 

 (Fremont Basin), 161 

 Explanation of charts, 103 

 Explanations and remarks on the 

 consolidated tables of resulting 

 mean temperatures, xi-xv 

 Extension of meteorological observa- 

 tions will reveal new features, 158 

 Extreme heat at Fort Simpson, 226 

 range for each month separately 



investigated, 227 

 ranges of temperature, 227 

 variations of temperature from 

 the normal values, 202 

 Extremes do not take place at the 

 hours of observation, 161 

 of daily fluctuation in December 

 and June, 159 

 represented by diagrams, 

 159, 160 

 of heat and cold observed in 

 Albany, N. Y., on the same 

 day, 199 

 of temperature in the great in- 

 terior basin of the United 

 States, 162 



Fahrenheit's scale employed iu tabu- 

 lation, xii 

 Florida, 105 



Fluctuation, anuual and daily, com- 

 pared, 110 

 apparently irregular, in the an- 

 nual means, 302 

 Fluctuations, corrections to be ap- 

 plied, 110 

 corrections when greatest and 



when least, 110 

 observed in certain localities are 

 united into a mean, 158 

 Freezing point of water iu July, 227 



Galveston, Texas, record completed 



by interpolations, 158 

 Geographical distribution of extreme 



cold, 226, 227 

 Geographical positions, authorities 



for, xi, xii 

 Gila river temperature, 106 

 Graphic method, value of. 103 

 Graphical representation of the tabu- 

 lar numbers, 193 

 Greatest constancy of temperature in 

 summer, 163 

 in winter, 163 

 Greatest depression in the daily fluc- 

 tuation of temperature in 

 the Arctic regions, 156 

 in the temperate zone, 156 

 Greatest heat of day, time of, in high 

 latitudes, 156 

 time of, in low latitudes, 156 

 Great lakes, influence of, on tem- 

 perature, 105 

 Gulf stream, effect of, 105 



Heat, accumulation of, greater in 



valleys than in plains, and 



most apparent iu the summer 



season, 1U6 



cause of accumulation of heat iu 



valleys, 106 

 distribution of, irregular, iu the 

 western part of the U. S., 

 105 

 normal, in the eastern part 

 of the U. S., 105 

 progress of waves of, 109 

 time of daily range of, 155 

 time of greatest, least, and aver- 

 age, of the day, ISt, 156, 157 

 transfer from more southern 



regions, 109 

 yearly average, 155 

 Heated plains of Columbia River, 



106 

 Heated regions along the Colorado 

 and Gila Rivers, the lower valley 

 of the Rio Grande, Hudson valley, 

 St. Lawrence valley, 106 

 High extremes in all months, places 



showing, 226 

 High heat in January, 226 

 Houily observations desirable from 

 Albuquerque, N. M., 161 

 from San Francisco, Cal., 

 158, 160 

 Hourly temperature at Mohawk, N. Y., 

 162 

 at Philadelphia, Pa., 162 

 Hours of observations, xii, xiii; 

 adopted by the Meteorol. Society in 

 Manheim, Germany, 110 ; at the 

 military posts of the U. S., Ill; 

 by the Smithsonian Institution 

 and the U. S. Patent Office, 111 ; 

 by the Royal Society, 111; differ- 

 ence of temperature at certain, 161 ; 

 difference of result of meteor, ob- 

 servations obtained when taken at 

 different, 110 ; improvement on. 111 

 Hottest region in the U. S., 106 

 Hypsometric chart, roughly con- 

 structed, 103 

 chart of the U. S., want of, seri- 

 ously felt, 103 

 requirements of a good, 103 



Incomplete monthly means, correc- 

 tion in case of, 173 

 Inequality iu the epoch of the annual 

 fluctuation of the temperature, 

 199 

 of the progressive march of tem- 

 perature, results of examina- 

 tion of, 200, 201 

 Insolation, increasing, 181 

 Interruptions in the regularity of 



annual fluctuation, apparent, 183 

 Investigations iu the apparent inter- 

 ruption in the regular7ty of annual 

 fluctuations attended by great la- 

 bor, 183 

 Irregularities, accidental and minor, 



302 

 Isocheimals, curves referring to the 



winter, 104 

 Isotherals, curves referring to the 



summer, 104 

 Isothermal charts, explanation of, 103 

 how constructed, 104 

 indications reviewed, 104 

 curves, connection of, with hyp- 

 sometric features, 105 



