566 Transactions. — Physics. 



The atmospheric circulation of both Poles should there- 

 fore be principally anticyclonic, but with lower pressure than 

 in other parts of the world, and consists of a series of anti- 

 cyclones having progressive movement towards east, their 

 limits poleward being- in very high latitudes, probably to 

 between 85° and 87°. 



But there are other easterly winds which, though they mav 

 not occur frequently, have been experienced in high latitudes 

 within which westerly winds predominate — i.e., on the pole- 

 ward edges of both west-wind belts — and they therefore do 

 not belong to any system of anticyclonic winds. Now, pre- 

 ciselv the same effect — viz., easterlv winds in west- wind 

 regions — is produced in temperate latitudes when a cyclone 

 from equatorial latitudes has advanced sufficiently far to carry 

 its easterly winds into the west-wind belt. 



There thus seems probability that there are low pressures 

 within both Arctic and Antarctic Circles, and if so their wind- 

 rotation must be cyclonic, and corresponding to that of the 

 cyclone of the opposite hemisphere, the area within which 

 they originate being near the Poles — arctic cyclones travel- 

 ling first from the Pole toward west, then curving towards 

 south and south-east ; antarctic cyclones travelling from the 

 Pole toward west, curving toward north and north • east. 

 These low pressures would convey cold and moisture, as 

 snow, into the west-wind belts, but though cold they would 

 be warmer than the anticyclonic systems of either Pole. 

 Between the poleward edges of the anticyclones and the 

 Poles there should be variable winds. 



If the mechanical principle upon which the horizontal 

 circulation of the atmosphere is arranged be such as has 

 now been described, then the corresponding vertical move- 

 ment should be that all anticyclonic systems are descending 

 currents, and all others are ascending currents. 



The governing principle regulating Horizontal atmospheric 

 circulation may be described as being that which controls the 

 movements of three belts placed alternately between four 

 circular discs, which press upon them sufficiently to insure 

 friction, as in rig. 7, in which it is evident that if the central 

 belt be pulled toward the left-hand side of the figure all the 

 other belts and discs must move in accordance. 



The governing principle of Vertical atmospheric movement 

 should be that which controls the uptake and downcomer cir- 

 culation of the multitubular boiler. 



The influence of the sun upon the whole atmosphere is 

 to cause all its systems to move southward from the time 

 he has attained to his maximum north declination until he 

 has reached his maximum south declination, from which 



