658 



H. MOHN. METEOROLOGY. 



NORVV. POL. EXP. 



Ekroll, 654. 



Fog, annual period, 537, 608. 

 diurnal period, 536, 608. 

 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, 540569. 

 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, 25248. 



Sledge-journey, 617-649. 



Latitude and Longitude of the Fram, 252. 

 "Lows", 577-587. 

 Lunar halos, 538. 



Maxima of pressure, 396. 



temperature, 482, 486. 

 Mean temperature months, 483. 



each day, 484. 



five day , 485. 

 Minima of pressure, 396. 



temperature, 482. 

 Mock moons, 538. 

 Mock suns, 538. 

 Motions of clouds, 522. 

 Motion of "lows", 583-586. 

 Normal 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, 316400, annual period, 395. 



- diurnal period, 316. 



_ . formulae and 



constants, 392. 



duration of, in one day of pr., 



534. 



- iiuBuma and minima, 3%. 

 . - Tables, 318-389. 



wind-roses, 397. 



wind-roses for 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, wind, 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, 401498. 



- above C., 487. 



absolute Max. and Min. 



486. 



annual period, 483. 



- aperiod. diurn. range, 482. 

 . - below - 40 C., 487. 



- diurnal period, 401, 



471, 603. 



