August 9, 1883] 



NA TURE 



S55 



thin dotted line of the lowest curve in the accompanying plate. 

 Alongside of them are arranged, both in the table and the plate, 

 the barometric abnormal movement of the meteorological stations, 

 Belgaum and Bombay. In order to facilitate comparisons 

 between the curves of these three stations the actual normal 

 movements, which are represented in the plate by thin dotted 

 lines, have been put through a double process of smoothing ; the 

 results are tabulated under the heading of ''Monthly Abnormal* 



(smoothed)," and are represented on the plate by the thick con- 

 tinuous lines. The observations not previously discussed are 

 those taken from June, 18S1, to September, 1882, of all the 

 stations, together with the Bombay record from February, 1880, 

 to June, 1SS1. 



The addition of this series to the Zanzibar record seems to 

 confirm the result of previous observations, viz. that there are 

 abnormal movements of the atmospheric pressure which affect 



a very wide area, and which are not simultaneous in all parts of 

 that area, but travel from west to east. An inspection of the 

 smoothed curve will show what amount of truth there is in this 

 statement. Thus the Zanzibar curve shows an upward bend at 

 a" and a downward bend at b", a second upward bend at c", and 

 a second downward bend at d". The Bombay and Belgaum 

 carves both show a similar general form, having upward bends 

 at A and a' corresponding with the upward bend a'' of the 



Zanzibar curve, downward bends D and e' corresponding with 

 the downward bend b" of the Zanzibar curve, and similarly C, c' 

 and D, d' corresponding with c" and d" of Zanzibar. And it is 

 at o ce seen that the movements at Zanzibar are in advance of 

 those of Bombay and Belgaum. Thus the Zanzibar maximum 

 A" took place in October, 1880, whilst the corresponding move- 

 ments did not appear at Belgaum until the month of January, 

 1881, and at Bombay until between January and February, 



