NO. 17.] 



INDEX. 



659 



Temperature of air, diurn. period, dark season, 



472, 496. 



— . _ _ _ and cloud, 47.3. 



— . _ _ _ and wind-velo- 



city, 478. 



— - — five-day means, 483. 



— - — 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. 



— — frecjuency, 256. 



— - - months, 268. 



— resultants, months, 315. 

 Wind-roses, atmic, 503. 



— baric, 397. 



— 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. 



