1880 1879 



Mean lieightof Barometer for the year.. 29,9.58 inches 29.952 inclies 



Maximum : 30.539 „ 30.513 „ 



Minimum 29.178 „ 29.087 



Eansre 1.361 „ 1.426 



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n 



IMaximnm Monthly Eange 1.276 „ 1.318 „ 



Minimum „ „ 554 „ .389 „ 



The maximum for this year occurred at 7 a. m. on February 26, wliilc 

 that for hast j"ear occv;rred in April. Tlie minimum for this year was recoixled 

 at 7 a. m. on March 20 while that of last year was in February. 



In regard to the maxima and minima given above, it must be remembered 

 that they are derived from the series of regular observations. On occasions of 

 extraordinary and rapid fluctuations in the barometer this series will often fail 

 to contain the extreme points reached. Without doubt, the lowest point reached 

 by the barometer during the year was touched at some time during the Typhoon 

 of October 4th. At 2 O'clock a. m. of that day a height of 28.735 inches was 

 observed. If this be compared with the maximum given above it greatly increases 

 the range for the year, making it 1.804 inches instead of 1.361 as obtained from 

 the regular series. Further reference to the barometrical fluctuations on that 

 occasion will be found in the brief account of the typhoon given under "the 

 wind. " 



The maximum monthly range for the year occurred in Älarch while the 

 greatest for Inst year was in February. The minimum fluctuation both for this 

 year and for last was in July. 



In Chart No 2 are exhibited, in the first diagram the fluctuation in the 

 monthly barometric mean, and in the second the maximum, minimum and range 

 for eacli month in the year. The curve in the first diagram shows three well 

 marked maximum points, these being for the months of February, April and 

 October and this will be found to agree with the results of last years' observations 

 upon an examination of the corresponding diagram in the report for 1879. In 

 the latter there is also a slight indication of a fourth maximum in the month of 

 July, but this is not repeated in the curve for this year, the mean for July being 

 lower than that for any other month. 



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