438 



The Rev. H. Llotd on the Meteorology of Ireland. 



foot of altitude ; and tlie fourth, the sums of the two preceding, or the total 

 corrections. 



These results are incomplete, no comparisons having been made of the ba- 

 rometers at the four inland stations. For this reason, and also because of the 

 uncertainty attending the comparison of barometers by means of portable in- 

 struments, I have thought it necessary to seek the corrections also by compa- 

 rison of the observed results themselves. In comparisons of the latter kind, 

 where the stations are widely separated, it seems necessary to employ the means 

 of somewhat extended series of observed results, during which the fluctuations 

 of barometric pressure are small. I have accordingly selected for the pur- 

 pose the monthly means of May, July, and September, in which months there 

 was but little variation of barometric equilibrium. The defects of the means 

 at each station compared with those at Dublin, for these months, are given in 

 the fifth, sixth, and seventh columns of the Table ; and the last column contains 

 the inferred corrections, which are equal to the mean differences -f "021 (the 

 reduction of the Dublin results to the sea-level). 



Table XV. Barometric Corrections. 



It will be seen by comparing the resulting corrections, in the fourth and last 

 columns of the preceding Table, that the agreement is satisfactory, except at 



