38 



THE VOYAGE OF H.M.S. CHALLENGER. 



TABLE.— Showing, for Forty-three Places in Western and Southern Europe, the 

 differences between the Monthly Barometric Means of the seven years 1878-84 

 and the fifteen years 1870-84. The minus sign indicates that the correction to 

 be applied to the means of 1878-84, to bring them to the means of 1870-84, is 

 subtractive, and no sign that it is additive. 



JY.B. — The differences or corrections are expressed in thousands of an inch. 



