192 
Transactions of the Boyal Society of South Africa. 
curve may represent dry anti-cyclonic conditions. Whatever be the 
actual value of these three component curves, it seems clear that the 
normal mean diurnal temperature curve has no very important physical 
signihcance over and above what the B curve may have. 
Note. — ^In the Tables of frequency- values of t~t' at the end, there is a 
line marked "Less" at the top, and a line marked "Greater" at the bottom. 
The numbers in these lines are residuals, outside the range of the numbers 
in the body of the Tables. Thus, e.g., between 2 p.m. and 3 p.m. in July 
there were — 
0 o 
34 times when the temperature rose by 1-1 to 1*5 
69 „ „ „ „ 0-6 „ 1-0 
76 „ „ „ „ 0-1 „ 1-5 
61 „ „ fell „ 0-0 „ 0-4 
25 „ „ „ „ 0 5 „ 0-9. 
Besides this there were 45 residual frequencies, i.e., 19 occasions when the 
rise was greater than l°-5, and 26 occasions when the fall exceeded 0°-9. 
