NO. 17.J 



INDEX. 



(15'J 



Temperature of air, diurn. period, dark season, 



472, 496. 



- and cloud, 473. 



- and wind-velo- 



city, 478. 



- five-day means, 485. 



- interdiurnal variability 



488. 



duration 

 of periods, 489. 



in the crow's nest, 497. 



- mean for each day, 484. 



monthly mean, Min. and 



Max., 482. 



normal for latitudes 



90-60, 575. 



Thermal wind-roses, 492. 

 Temperature of the polar ice, 22, 540. 



annual period, 561. 

 isopleths, 567. 

 observations, 544. 

 variation with 



depth, 562. 



Thermometers, 10, 612. 

 Twilight, 589, 594. 

 Tension of vapour, 499. 



annual period, 502, 607. 

 - - - diurnal - 499, 607. 



Variability, temperature of air, 488. 

 Water-sky, 538. 

 Wind, 3. 



direction, 255. 



annual period, 279. 

 constancy and change, 286. 

 diurnal period, 274. 

 frequency, 256. 



months, 268. 



resultants, months, 315. 

 Wind-roses, atmic, 503. 

 baric, 897. 



change of pressure, 399. 

 dynamic, 311. 

 nephic, 519. 

 relative humidity, 509. 

 precipitation, 528. 

 thermal, 492. 

 windward side, 284. 

 Wind, velocity, annual period, 309. 



diurnal - 290, 597. 



and cloud, 295. 



and velocity, 299. 



- of calms, 307. 



of fresh winds, 305. 



- of gales, 307. 

 in "Lows", 583. 



Winter-hut, observations, 625. 



climatological table, 650. 



