REV. R. F. WHEELER, M.A., AND DR. HOOPPELL. 



499 



the name of the station, where it has been corrected for diurnal 

 range by the letter cl, where it has been corrected for height 

 above the sea-level by the letter h. This latter correction ap- 

 pears to have been made only in the case of Wylam. In com- 

 puting the averages, given in the line above Greenwich, Wylam 

 has, for this reason, been omitted, and the averages may there- 

 fore be compared with the results exhibited for Wylam, as well 

 as with those shown for Greenwich. Two subsidiary tables are 

 given below, summarising some of the principal results embodied 

 in the general table. The absence of complete details respecting 

 some of the stations, and in particular respecting Allenheads, 

 makes these subsidiary tables less perfect than the editors could 

 have wished. 



In addition to the subsidiary tables, a third is given, contain- 

 ing the mean monthly pressure, and the mean monthly range of 

 pressure, at Durham Observatory, for the twenty-two years, 

 1850-1871. These interesting particulars have been supplied by 

 Mr. J. J. Plummer, and are printed side by side with the same 

 results for 1871, as embodied in the general table, for com- 

 parison. 



I. 



j 



Average Extremes and Range of Pressure, and Mean Pressure, FOR 

 WHOLE DISTRICT, in the several Months of 1871. 



MONTHS. 



Q> 0) 



to a 



o =s 



g 



(3 $ 



an 





30-22 

 30-17 

 30-42 

 30-13 

 30-30 

 30-23 

 29-98 

 30-35 

 30-34 

 30-34 

 30-22 

 30-29 



28-48 

 29-18 

 29-20 

 28-95 

 29-51 

 29-37 

 29-13 

 29-26 

 29-19 

 28-97 

 29-26 

 29-15 



1-74 

 0-98 

 1-22 

 1-17 

 0-78 

 0-85 

 0-87 

 I'll 

 1-16 

 1-38 

 0-97 

 1-16 



29-52 

 29-64 

 29-72 

 29-54 

 29-85 

 29-73 

 29-50 

 29-72 

 29-68 

 29-65 

 29-77 

 29-71 









Mav 



















Average for Whole Year 



30-25 



29-14 



1-12 



29-67 



