OF THE OBSERVATIONS FOB ATMOSPHERfC PRESSURE. 1(17 



The monthly range is greatest in winter and least in summer in Baffin Bay and 

 at Van Rensselaer Harbor ; at Port Kennedy the amount of range is rather irre- 

 gularly distributed over the year. 



Absolute observe.d maxima and minima and extreme range (corrected for index 

 error and referred to the level of the sea by the addition of 0.01). 



Relation of the Atmospheric Pressure to the Direction of the Wind. 



In this investigation the aneroid readings alone have been employed. For this 

 purpose the daily readings at the hours 6 A. M. and 6 P. M., and at noon and 

 midnight, were compared with the corresponding mean of five days (two days 

 before and two days after the day in question). This substitution of the penthe- 

 mers for the monthly means, as normals, was considered a desirable improvement. 

 Each difference was inserted in the column for the respective wind (eight in all 

 with a column for calms). In the exceptional case, where no observation was 

 made at one or the other of the above hours, the observation at tbe nearest hour 

 adjacent was substituted. A + sign indicates a pressure higher than the mean, 

 a — sign a pressure lower than the mean. The following table contains the results 

 arranged for two localities of one years' observations for each (commencing with 

 September) ; the results at Port Kennedy for the S. E., S., and S. W. winds, are 

 contracted in one mean on account of the scarcity of wind from these directions. 

 The results for Van Rensselaer 1 have been added for comparison. 



1 Exchanging the magnetic for the true direction, on page 111 of Dr. Kane's meteorological record 

 and discussion ; a correction already referred to before. 



