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Report S.A.A. Advancement of Science. 



on the whole it appears that the minimum temperature variability 

 is probably common to the whole country, while the maximum 

 temperature is determined mainly by local conditions. There is a 

 further curious point that the maximum temperature variability is 

 greater than that of the minimum in every month, both at Kimberley 

 and Durban, whereas at East London the minimum values are the 

 greater in the last quarter of the year. In particular, it may be noted 

 that great individual values of the maximum temperature variability 

 do not frequently occur in pairs, on alternate days, at Kimberley, as 

 they do at East London and Durban. The average maximum tem- 

 perature variability at Kimberley for the year is 4.3°, that for the 

 minimum is 3.7°. Thus the mean variability is greater on the table- 

 land than it is on the coast. The greatest monthly mean maximum 

 temperature variability at Kimberley during the ten years 1896 to 

 1905 is found in October, 1899, with 8.1°, the least in July, 

 1905, with 1-7°. The greatest monthly mean minimum temperature 

 variability is found in October, 1904, with 6.5°, the least in April, 

 1905, with 1.6°. These greatest and least values are not common 

 to the whole country ; it by no means follows that a high value of the 

 variability at one station indicates a high value at another at the 

 same time. 



The monthly average values of the variability of dew-point and 

 relative humidity, at Kimberley, at 2 a.m. and 2 p.m., are as 

 follows : — 



Table 4. — Variability of Dew- Point at Kenilworth 

 (Kimberley), 1896 to 1905. 



