Mr. W. R. Birt on a remarkable Barometric Depression. 23 



The I'eadings of the 25th are still in accordance with the re- 

 sults already arrived at. Tiie trough between the two maxima 

 occurred at 10 p.m. of the 25tl), so that the readings of the 

 2.5th were those of the posterior slope of the first elevation. 



Table IX. — Barometric Readings, Royal Observatory, 

 Greenwich. 



In this year the barometer passed a maximum on the 25th 

 at 10 A.M., and this reading was the highest of the five days. 



Table X. — Barometric Readings, Royal Observatory, 

 Greenwich. 



The barometer again passed a maximum on tlie 25th at 

 10 a.m., and, as in 1842, tiiis reading was the highest of the 

 five days. 



The observations in the four years fully confirm the results 

 deduced from the observations as given in Howard's Climate 

 of London. 



By the kindness of Captain Childers, who has placed in my 

 hands the hourly observations which he communicated to the 

 British Association at its last meeting, I am enabled to ascer- 

 tain the state of the barometer at St. Heller's, Jersey, for the 

 above-named days in the years ISll and 184-5: it is strictly 

 in accordance with all that has preceded. 



