XII 



Page 



The Pressure of the Air 316 



Diurnal Period 316 



Tables 318 



Formulae and Constants 392 



Annual Period 395 



Maxima and Minima 396 



Baric Wind-Roses 397 



Wind-Roses for the Change of Pressure 399 



The Temperature of the Air 401 



Diurnal Period 401 



Tables 402 



Positions of the Fram 469 



Diurnal Period 471 



— in the dark Season 472 



— and Amount of Cloud 473 



. Wind-Velocity 478 



Monthly Means. Minima and Maxima 482 



Aperiodic diurnal Range 482 



Temperature. Annual Period 483 



Mean Temperature for each Day of the Year 484 



Five-Day Means 485 



Absolute Minima and Maxima 486 



Days and Periods with a Temperature below —40° 487 



— - - above 0° 487 



The interdiurnal Variability 488 



Duration of Periods 489 



Thermal Wind-Roses 492 



Diurnal Period in the dark Season 496 



Temperature in the Crow's Nest 497 



The Tension of aqueous Vapour 499 



Diurnal Period 499 



Annual Period 502 



Atmic Wind-Roses 503 



The relative Humidity 505 



Diurnal Period 505 



Annual — 508 



Wind-Roses 509 



Cloud 511 



Amount of Cloud. Diurnal Period 511 



Diurnal Period and Wind- Velocity 514 



Annual Period 518 



Nephic Wind-Roses 519 



Forms of Cloud 520 



Diurnal Period 520 



Annual Period 522 



