SHORT MEMOIRS ON METEOROLOGICAL SUBJECTS. 



451 



pheric whirlwinds harmonizes with nature, I will compare its results with 

 the phenomena that were observed at St. Thomas, August 2, 1837, when 

 the so-called Antigua hurricane, which is described by Professor Dove 

 in Poggeudorfi's Annalen der Physik, vol. 52, passed over the island, 

 causing fearful havoc both there and on the island of Porto Eico, which 

 is situated at a distance of 20 Danish miles* from St. Thomas. 



The phenomena observed as prevailing during the hurricane were, 

 according to Professor Dove, as follows: 



* Hurricane. 



In view of the above data, we may consider that the hurricane raged 

 from the northwest until the calm space reached the island, and that it 

 again suddenly burst forth from the southeast after its center had passed 

 St. Thomas. The progressive movement of the hurricane, which, from 

 general experience, we may consider as having been uniform during the 

 time of its passage over the island, may therefore be assumed to have 

 been in a west-southwesterly direction toward Porto Eico. If we now 

 observe that in such a rotating mass the pressure of the air must be 

 considered as equal at all points that are equidistant from the axis of 



» The Danish mile is equal to about 44 English miles. 



