658 



H. MOHN. METEOROLOGY. 



NORW. POL. EXP. 



Ekioll, G54. 



Fog, annual period, 537, 608. 



— diurnal period, 536, G08. 



— number of days with, 537. 



Gales, 307, 583. 



Halo, solar and lunar, 538. 

 Hours of observation, 21. 

 Humidity, see Relative humidity. 

 Hygrometers, 15. 



Ice, Temperature of polar, 540—569. 

 Ice-temperatures, 22. 

 Instruments, 3—22. 

 Isabnormals, temperature, 576. 

 Isobars around the North Pole, 571. 

 Isopleths, ice-temperatures, 567. 

 Isotherms around the North Pole, 573. 



Journal of observations, Fram, 25—248. 



— - — Sledge-journey, 617—649. 



Latitude and Longitude of the Fram, 252. 

 "Lows". 577-587. 

 Lunar hales, 538. 



Maxima of pressure, 396. 



— - temperature, 482, 486. 

 Mean temperature months, 483. 



— — each day, 4-84. 



— — five day — , 485. 

 Minima of pressure, 396. 



— • temperature, 482. 

 Mock moons, 538. 



Mock suns, 538. 



Motions of clouds, 522. 



Motion of "lows", 5S3-586. 



Norma) temperat. of air, latitude 90° -60°, 575. 



North Pole, temperature, 574. 



Observations, Fram, 25—248. 



- Sledge journey, 617-649. 



Optical phenomena, 538. 



Periods, see annual and diurnal periods. 



Position of the Fram, 21, 252. 

 Precipitation, 20. 



— amount of, 535. 



— annual period, 526, 608. 



— diurnal period, 525, 608. 

 Pressure of air, 316—400, annual period, 395. 



— - — diurnal period, 316. 



— . — — — formula! and 



constants, 392. 



— - — duration of, in one day of pr., 



534. 



— maxima and minima, 396. 



— Tables, 318-389. 



— wind-roses, 397. 



— wind-rosesfor change of, 399. 



— number of days with, 531. 



— probability of, 526. 



— wind-roses, 528. 



Radiation, thermal, 593. 



Range of temperature, aperiodic, 482. 



Relative humidity, annual period, 508. 



diurnal - 505, 607. 



— — wind-roses, .509. 

 Resultants, vfind, 315. 



Results, 249. 



Seasons, 253. 

 Shadow of the earth, 594. 

 Ship's position, 21. 

 Sky, State of, 20. 

 Sledge-Expedition, 609. 

 Solar halos. 538. 

 State of the sea, 21. 

 Spitzbergen, 654. 

 Sunny season, 253. 



Temperature of air, 401-498. 



. - above 0° C, 487. 



— - — absolute Max. and Min. 



486. 



— - — annual period, 483. 



— - — aperiod. diurn. range, 482. 

 - - below - 40° C, 487. 



— • — diurnal period, 401, 



471, 603. 



