INDEX. 



Anemometer, 3. 



Annual migration of isotherm of 0° C, 575. 



Annual period of amount of cloud, 518, 608. 



— • atmospheric pressure, 395. 



calms, 310. 



fog, 537, 608. 



forms of clouds, 522. 



precipitation, 527, 608. 



relative humidity, 508, 607. 



temperature of air, 483,606. 



- at the North Pole, 574. 



— of polar ice, 561. 

 tension of vapour, 502, 607. 

 wind's direction, 279, 



- velocity, 309, 602. 

 Aperiodic range of air-temperature, 482. 

 Atmic wind-roses, 503. 

 Atmosph. pressure around the North Pole, 571 . 



Baric wind-roses, 397. 

 Barometers, 4, 609. 

 Barometrical depressions, 577. 



— — direction of motion of, 



577, 583. 



— — lowest pressure in, 581. 



— — number of, 581. 



— — passing the Fram, 582. 



— — velocity of motion, 583. 



— _ _ . wind, 583. 

 Belts of Cirrus, 525. 



Calms, annual period, 310. 

 — diurnal period, 307. 

 Change of pressure, 399. 

 Cirrus-belts, 525. 



Climatological table. Winter-hut, 650. 

 Cloud, 20, 511. 



Cloud, amount of annual period, 518, 608. 

 - diurnal - 511,514,607. 



- Forms of, 520. 



- — • annual period, 522. 



- - . diurnal - 520. 



- Motion, 522. 



- Wind-roses, 519. 

 Columns above Sun and Moon, 538. 

 Compass, 3. 



Crow's nest, temperature of air, 497. 



Dark Season, diurnal period of pressure, 393. 

 — — of temperature, 472. 



Days with precipitation, 531. 

 Diurnal period of calms, 307. 



. cloud, 511, 607. 



- fog, 536, 608. 



— - forms of clouds, 520. 



— - fresh winds, 305. 



— ■ gales, 307. 



— - precipitation, 526, 608. 



— - pressure of air, 316, 390. 



— - relative humidity, 505, 607. 



— - temperature of air, 401, 



471,603. 



— ■ — - dark season, 



472, 603. 



— ■ tension of vapour, 499, 607. 



— ■ wind's direction, 274. 



■ wind's velocity, 290, 295,299, 

 597-603. 

 Dynamic wind-roses, 311. 



83 



