GEOLOGICAL SOCIETY OF PENNSYLVANIA. 345 



It is not my intention at present, however, to present 

 all the coincidence in favour of this theory which I have 

 collected; my object is to call the attention of the mem- 

 bers of this Society, and meteorologists generally, to the 

 importance of the subject, and to request them to turn 

 their attention to the following queries, which are indi- 

 cated by the theory : — 



1st. Does the wind always blow towards the centre of a 

 great rain in the lower part of the cloud, and from the 

 centre of the rain in the upper part of the cloud, except 

 as modified by the prevailing currents of wind? 



2d. Do those storms which travel from the south west 

 to the north east, always set in with the wind north east 

 and also terminate with the wind south west, when the 

 centre of the storm passes over the observer? 



3d. If the wind does not change at the termination of 

 one of these north east storms, is it because there is an- 

 other not far distant in the south west? 



4th. Is the direction of these storms determined by 

 the uppermost current of air in our climate (which is 

 known to be very uniform from the south west), carry- 

 ing in that direction the air which rises into it, in the 

 region of the storm ? 



5th. Is the prevailing direction of storms in the torrid 

 zone towards the north west on the north of the equator, 

 and towards the south west on the south of the equator, 

 setting in with the wind in the opposite direction? 



6th. If a storm passes to the south of us travelling 

 eastwardly, does the wind change by the north towards 

 the west; and if the storm passes to the north of us, does 

 the wind change round by the south, blowing with a vio- 

 lence in proportion to the quantity of rain and its prox- 

 imity combined? 



7th. Is the direction in which a narrow storm travels, 

 sometimes determined by a middle current moving in a 

 different direction from the uppermost current? 



