Diagram showing (1) the MEAN PRESSURE, (2) the MEAN MAXIMUM, and 



(3) MINIMUM PRESSURE, with (5) ABSOLUTE MAXIMUM, and (5) 



MINIMUM PRESSURE, of the ATMOSPHERE, for each Month in the 



51 Years 1850 to 1900 inclusive, at the Royal Institution of Cornwall, 



Truro. _. ^ 



Diagram I. 



