OBSERVATION OF DAYS 



To the above Madeira daily observations, some necessary corrections have been applied 

 for each day, viz. 



To the Aneroid Barometer a final balance of + and corrections, or -f 0.04 inch has 

 been added to make it show the height of a Mercurial Barometer at the sea-level, and at a 

 constant temperature of 68 F. ; the reference for the corrections being the Funchal 

 Barometer, for the same days as published in the daily bulletins of M. Ed. Mascart, Director 

 of the Central Office of Meteorology of France, in Paris, and obligingly presented by him, 

 perpetually, to the Royal Observatory, Edinburgh. These very important French-published 

 Funchal Barometer readings are also given in a column of their own, after being reduced 

 from millimetres to British inches; and from freezing to 68 F. ; the reduction to sea-level 

 having been already performed. 



To the minimum thermometer, after having added 4 daily for deficient column, a 

 contrary correction of 2 has been subtracted on account of its over-sheltered position, too 

 far within the dwelling-house, rather than outside it. 



To the Maximum Thermometer a correction of 2 has also been made, to eliminate 



