174 ANNUAL IlEPOET SMITHSONIAN INSTITUTION, 193 3 



I 234 5&7 8 9I0 1I 



I 234 56789 10 II 

 MONTHS 

 Figure 16. — The ll-month period in temperatures of Cape Town, during sun-spot minima 

 only, 1865 to 1925. Siiift of phase shows true period 331 days. 



