NO. 17.] 



THE TENSION OF AQUEOUS VAPOUR. 



501 



From these Tables and the diagrams on PI. VI. (1 cm. = 01 mm.) are 

 taken out the epochs and the values of the diurnal Minima and Maxima, and 

 the diurnal Range as shown in the following Tables. 



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 



3"5 a. m. 

 3 a. m. 



2'5 a. m. 



2 



4 



3 



1 



2 



2 



9 



3 



1 



a. m. 

 a. m, 

 a. m. 

 a. m. 

 a. m. 

 a. m. 

 p. m. 

 p. m. 

 a. m. 



3 a. m. 



3 a. m. 



2 a. m. 



2 a. m. 



2-5 a. m. 

 2 a. m. 

 1'5 a. m. 



2-5 a. m. 



- 4-2 



- 26 



- 7-4 

 -11-5 

 -19-8 

 -13-8 



- 6-7 



- 9-8 

 -14-1 



- 1-7 



- 0-3 



- 1-8 



- 2-6 

 -12-4 



- 9-5 



- 5-2 



- 1-9 

 -11-5 



-10-8 



- 7-5 



8 p. m. 

 5 p. m. 

 5 p. m. 

 2 p. m. 

 4 p. m. 

 3-5 p. m. 

 2 p. m. 

 2 p.m. 

 2 p. m. 



Noon 



10 p. m. 



2'5 p. m. 



8 p. m. 

 35 p. m. 

 2 p.m. 



2 p. m. 



Noon 



3 p.m. 



2 p.m. 



3 p. m. 



1-5 



3-5 



9'0 



13-6 



11-3 



7-3 



9'3 



10-9 



2-5 



1-5 



0-9 



1-3 

 8-4 

 91 

 4-3 



11 

 9-7 

 6-8 



5-6 



0-064 

 0-041 

 0-109 

 0-205 

 0-334 

 0-251 

 0-140 

 0191 

 0-250 

 0-042 

 0-018 

 027 



0039 

 0-208 

 0-186 

 0095 



0-030 

 0-212 

 0-176 



0-131 



