NO. n.] 



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. 



Minimum. 



Hour. 



Dev. 



Maximum. 



Hour. 



Dev. 



Range. 



January 



February 



March 



April 



May 



June 



July 



August 



September .... 



October 



November 



December 



Winter 



Spring 



Summer 



Autumn 



Dark Season . . . 

 Sunny Season . . 

 Equinoct. Months 



Year 



6 p. m. 



3 a. m. 

 Mnt. 



2 a. m. 



5 a. m, 



4 a. m. 



6 a. m. 

 4 a. m. 

 4 p. m. 



4 a. m. 

 Mnt. 



5 a. m. 



3 a. m. 

 2 a. ra. 



4 a. m. 

 4 a. m. 



4 a. m. 

 4 a. m. 

 4 p. m. 



4 a. m. 



-0-45 

 -0-55 

 -0-27 

 -0-71 

 -0-20 

 -0-27 

 -0-40 

 -0-24 

 -0-28 

 -0-56 

 -0-24 

 -0-22 



-0-25 

 -0-34 

 -0-29 

 -0-20 



-0-30 

 -0-33 



-0-18 



-0-27 



8 a. m. 

 10 a. m. 



8 a. m. 

 2 p.m. 



9 p. m. 

 6 p. m. 



Noon 

 9 p. m. 

 6 a. m. 

 2 p. m. 

 8 a. m. 

 10 p. m. 



10 a. m. 



1 p. m. 



6 p. ra. 



2 p.m. 



Noon 



7 p.m. 



8 a. m. 



Noon 



+ 0-48 

 + 0-80 

 + 0-53 

 + 0-55 

 + 0-18 

 + 0-25 

 + 0'24 

 + 0'23 

 + 0-29 

 + 0-55 

 + 0-35 

 + 0-31 



+ 0-34 

 + 0-21 

 + 0-20 

 + 016 



+ 0-28 

 + 0-18 

 + 0-35 



+ 0-17 



0-93 

 1-35 



0-80 

 1-26 

 0-38 

 0-52 

 0-64 

 0-47 

 0-57 

 111 

 0-59 

 0-53 



0-59 

 0-55 

 0-49 

 0-36 



0-58 

 0-51 

 0-53 



0-44 



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 0—10). 



65 



