206 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 'JO 



remarked, there is a very good agreement between the variations 

 of air pressure and temperature at Batavia such that the air pres- 

 sure variations occur somewhat earlier than the variations in tem- 

 perature. From figure 71 we see that a complete agreement exists 

 between the air pressure variations at Batavia and at Wellington. 

 A similar agreement with Batavia we find on the whole in the air 

 pressure curve for Mauritius, but not so thorough. However, in 

 the latter years after 1902, there is a tendency to march oppositely 

 or with a very great displacement of phase. The air pressure in 

 Antananarivo shows completely the same variations as at Mauri- 

 tius. For the two last named stations there is in relation to Batavia 

 so great a phase displacement, especially with regard to the air 

 pressure, that the air pressure curves for these stations go generally 

 in opposite direction to the curves for temperature. That the 

 air pressure variations occur some months earlier on Madagascar 

 and Mauritius than at the stations in India and in Java agrees also 

 with Chambers' results earlier mentioned. 



We go now to the two stations in West India and find there 

 less well-marked variations in air pressure and a less or even no 

 agreement with the air pressure variations in the four tropical sta- 

 tions of the eastern hemisphere. The air pressure curves for these 

 West Indian stations show also less agreement with the temperature 

 curves for the same stations. Where there is a tendency to correla- 

 tion it runs in the direction of opposition. 



The air pressure variations at three stations on the American 

 continent are given in figure 74. They show slight similarity with 

 our tropical air pressure curves, but on the whole less marked varia- 

 tions. The greatest similarity is shown by the curve for Galves- 

 ton with the two curves for the West Indies, as was to be expected. 

 It appears also that a certain degree of agreement exists between 

 the air pressure variations in Galveston and in Washington. The 

 air pressure variations in these American stations appear to be 

 most opposite in their course to the temperature variations in the 

 corresponding regions. In the interval from 1888 to 1902, the air 

 pressure curve for Washington shows the same course as the tem- 

 perature curve for this region on the whole. 



THE AIR TEMPERATURE IN STOCKHOLM 



As earlier mentioned Wallen has found several periods of short 

 interval for the variations of air temperature in Stockholm. Of 

 these, one is of about two years or twenty-six months. Also he 



