XII 



Page 



The Pressure of the Air 316 



Diurnal Period 316 



Tables 318 



Formula; and Constants 



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 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 



