N D EX. 



Anemometer, 3. 



Annual migration of isotherm of G., 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. 

 Atone 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 



