1834.] on Atmospherical Phenomena. 353 



New Moon, Night. Full Moon, Day. 



ft. in. ft. in. 



14 6 15 2 



14 2 15 1 



14 8 15 



14 3 14 5 



14 6 14 5 



14 5 15 3 



14 6 14 3 



14 8 14 6 



14 6 14 5 



15 5 14 3 



15 6 14 3 



15 3 14 4 



I have noticed this because, by supposing a similar anomaly in the 

 case of the tides of the air, we may explain why the ninth day before 

 new moon has a less proportionate rain-fall in summer, (when the 

 moon at that age has usually south declination,) than it has in winter, 

 when the moon at that age has north declination ; and vice versa, why 

 the fifth day after new moon has a greater excess of rain-fall in sum- 

 mer, when its moon has north declination, than in winter, when its 

 moon has south declination. Were the lunar theory correct, the 

 excess in one tide, owing to the moon's declination, would be compen- 

 sated by the defect in the opposite tide. Similar anomalies commonly 

 prevail. Thus we read, " At Brest when the moon has great declination 

 the superior tide may be three times greater than the succeeding, or 

 inferior tide ; but the fact is, they differ very little. M. La Place says, 

 they do not differ at all." — (Mechan. Philos. iii. 365.) But to return 

 to the matter before us. Having made out a table of the dew-points at 

 Calcutta for 1832, I selected the heights of the same days as are stated 

 in Mr. Noton's paper of the Bombay tides, and took the average in 

 the same way. Comparing the times of new and full, the numbers were 



New. Full. 



53-1 46-3 



54-3 62-1 



66-8 59-2 



74-5 729 



78-1 77-6 



77'5 74-9 



77-6 76-2 



77-3 77-0 



75-3 76-4 



73-2 74-5 



58-8 64'3 



51-5 58.0 



Z Z 



