NO. 17.] 



CLOUD. 



513 



From these Tables are taken out the epochs and values of the diurnal 

 minima and maxima and the diurnal range, as shown in the following 

 Table. 



In the means for the seasons, the Table shows a regular diurnal period 

 of the amount of cloud. The day is more cloudy than the night. The 

 range is greatest in winter, and least in autumn. PI. VII (1 cm. = 1 of 



the scale 010). 



65 



