468 Miss Cave-Browne-Cave and Prof. K. Pearson. [June 3, 



such a conclusion as that the barometer in the north of Norway may 

 be as closely related to a station — St. Helena in the southern hemi- 

 sphere — as to Valencia in its own ; the correlation for the winter 

 months of Valencia and B0cl0 is 0*0590, while its correlation with 

 St. Helena for the winter months is - 0*0841. Valencia, far nearer 

 to St. Helena, is less highly correlated with it than B0d0 is, while 

 B0d0 itself is nearer related to St. Helena than to Sierra Leone. The 

 relationship here is not, be it remembered, a relationship of average 

 heights, but of the daily fluctuations of the barometer at the two 

 stations — i.e., it would be safer to predict the barometric height in 

 the winter at B0d0 on any day from the height on the same day at 

 St. Helena, than to predict it from the height at Valencia. Eesults 

 of this kind seem of sufficient interest to deserve notice, even before 

 the whole material has been collected and reduced. 



What we are certain about is, that a zone of positive correlation is 

 followed by a zone of negative correlation. What we are less sure 

 about is, that this negative zone is again followed by a positive zone 

 of much less intensity, but our rather meagre results certainly sug- 

 gest it. 



(6.) The accompanying tables give the more complete results for the 

 five more northerly stations. 



Table II. — Height and Variation of Barometer at East Atlantic 



Stations. 



Means in mm. 



Period. 



Bodo. 



Skudesnaes. 



Valencia. 



Lisbon. 



Funchal. 



„ Whole year. . 



757 -006 

 753 *315 

 755 -194 



758 -324 



757 -866 



758 *099 



760 -285 

 760 *013 

 760 -151 



763 '328 

 765 516 



764 -402 



764 -558 



765 -030 

 764 *790 



1889-1898. Summer. . . 



"Winter. . . . 

 ,, Whole year 



758*174 

 754 *171 

 756 -210 



759 -008 



757 -927 



758 *478 



761*160 

 760*278 

 760 -727 



763 -199 

 764*895 



764 -031 



764 -721 

 764 *929 

 764 -823 



1879-1898. Summer. . . 



Winter . . . 

 Whole year 



757 *590 

 753 -743 

 755 *702 



758*666 

 757*896 

 758 *288 



760 -722 

 760*145 

 760 *439 



763 *264 

 765 -206 



764 -217 



764 *639 

 764 -979 

 764 -806 



For brevity, the probable errors are not at present given, but the 

 differences between the two decades are as a rule sensibly larger than 

 the probable errors. Several interesting results flow from this table. 

 Thus, north of Valencia, the summer barometer is higher than the 

 winter ; south of Valencia, the winter higher than the summer. In al 

 cases the winter height is more variable than the summer, but the 



