Fig. 3 represents a very hif^li potential on the occasion of a lia^e. The 

 weatlicr was exceedingly calm with perfectly cloudless sky. There was a thick 

 haze from 8 a. m. to 11 a. m. on the 18th. 



Fig. 4 represents a case of the potential undisturhcd by a haze. On Oct. 14, 



1900, there was a light rain in the afternoon, which ceased at 2.55 p. ra. On the 

 morning of the 15th, the weather was clear and calm^ and the surface was very wet. 

 There was a tliick haze from 7 a. m. 



Fig, 5 represents a case of the potential undisturbed by a fog. On Jan. 21, 



1901, there was rain in the morning, which became light from 2.10 p. m. and ceased 

 at 3.40 p. m. There were also some showers in the night. On the morning of the 

 22nd there was a fog. 



