404 DR. C. CHREE: ANALYSIS OF KKSl'LTS FROM THE FALMOUTH MAdNKTo 



extreme years of an 11-year period amounting to 07fl ( '. At an avfi-.-ip- extra- 

 tropical station, according to HANN, this latter figure is reduced to 0'54 0. Allowing 

 tentatively a corresponding reduction on the 0'55 0., it becomes 0'41 ('. Thus the 

 differences recorded in Table XX. are not merely of the normal sign, but even of 

 somewhat the same order of magnitude as they should be according to HANX at an 

 average extra-tropical station on the average of a number of sun-spot periods. 



The fact that in Table XX. a rise in the mean annual temperature is associated 

 with a diminution in the mean daily range may be accidental, but is possibly worth 

 fuller investigation. 



19. Table XXI. shows the variation throughout the year at Falmouth in the 

 mean vapour-pressure for the 24 hours, in the daily range of temperature, and in the 

 amplitudes of the 24-hour and 12-hour terms in the diurnal inequality of temperature. 



TABLE XXI. Monthly Relative Values (100 = mean from 12 months). 



The mean monthly values are expressed as percentages of their arithmetic mean. 

 The vapour-pressure and temperature-range data are based on the tables in the 

 Falmouth Reports for 1891 to 1902. The data for c t and c a relate to the period 

 1871 to 1882, and are calculated from mean absolute monthly values given by 

 General STRACHEY.* The figures in the columns headed "magnetics" are means 

 from the data for D and H in Tables IX. and XIII. The small figures give the excess 

 over corresponding percentages for Kew. The magnetic data employed here for Kew 

 refer, like the Falmouth, to D and H only, and so differ slightly from those given in 

 Table XLVIII. of (A). There is a general resemblance between the annual variations 

 of vapour-pressure, temperature range, and magnetic range : but, as at Kew. the 



* 'Phil. Trans.' for 1893, p. 644. 



