292 
Transactions of the Royal Society of South Africa. 
scale diagram. Both curves agree in the main, but with two important 
exceptions : First, that the moon-rise maximum of pressure is not reflected 
in the wind curve ; and next, that the wind velocitv reverses to a minimum 
f.OOO 
•999 
•998 
•997 
Air pressure b) and wind velocity (w) during- the lunar day. 
at TJ.M.P. Both curves end the day at a lower level than they began it, 
and both show a snmll irregularity at XXIII. It is evident, as pointed out 
in the previous papers, that the lunar influence upon the velocity of the 
wind cannot be exerted in a simple way through the medium of the air-tide, 
