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SOME CAUSES AND EFFECTS OF VAEIATION IN THE 
EANGE OF TEMPEEATUEE. 
By J. E. Sutton, Sc.D., F.E.S.S.Af., Hon. Memb. E.Met.S., and 
Elizabeth M. Sutton, F.E.Met.S. 
(Eead October 18, 1911.) 
The present joint paper contains the results of a discussion of some of 
the more saHent meteorological aspects of a variation in the range of air 
temperature. The investigation was instituted with the primary object of 
determining what variation, if any, of the diurnal curve of barometric 
pressure might accompany a greater or less range of temperature as night 
followed day ; but other points had necessarily to be considered so that 
we might be able to assign as nearly as possible the position of the range 
curve in the sequence of meteorological cause and effect. We have, 
however, adhered to our original intention of making the range of 
temperature the basis of the argument. 
The meteorological elements taken into account here are the monthly 
means of : — 
1. The diurnal range of air temperature ; 
2. The maximum temperature of the air ; 
3. The minimum temperature of the air ; 
4. The hourly mean temperature of the day ; 
5. The range of dew-point temperature from VIII. to XIV. ; 
6. The hourly mean dew-point temperature ; 
7. The range of relative humidity from VIII. to XIV. ; 
8. The hourly mean relative humidity ; 
9. The range of barometric pressure from VIII. to XIV. ; 
10. The hourly mean pressure ; 
11. The mean percentage of sunshine ; 
12. The mean percentage of cloud derived mainly from six observations 
a day ; 
13. The mean rainfall ; 
14. The total rainfall in the period studied. 
