300 Transactions of the Boyal Society of South Africa. 
The mean resultant direction for the day is from somewhere to the- 
north of south-east, due, no doubt, to the influence of the trade winds ; * 
while the hourly resultants show land- and sea-breeze movements ap- 
proximately parallel to the north arm of the oblique angle of coast 
forming Delagoa Bay. The sea-breeze effect as depicted in Fig. 2 is at 
its height from XV. to XVII. o'clock, while the land breeze reaches 
its maximum just before sunrise. The counter-clockwise rotation of 
the vane is not apparent at Louren90 Marques. 
* The mean resultant direction at East London is almost exactly from the opposite 
direction. 
EXPLANATION OF THE FIGUEES. 
In Fig. 1, the vectors QiO, Q2O, Q3O, Q4O represent the resultant directions in magni- 
tude and direction for each quarter of the year. 
In Fig. 2, the resultant direction for any hour is supposed to blow from the place of 
that hour on the diagram to the origin 0. Thus, e.g., at XIX. o'clock the resultant 
direction is from almost due east. The vector EO represents the total resultant direction 
for the year in direction, but on a reduced scale. 
