NO. 17.] 



INDEX. 



659 



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, 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. 



. 



