2 Systematic Progression of Storms. 
The nearly symmetrical forms of the semi-orbital curves which 
are shown in the routes of these storms, and their obvious rela- 
tions to the observed courses of the great aerial currents, both in 
the intertropical and temperate latitudes, appear to warrant the 
_ conclusion that they all pertain to one prevalent system of atmos- 
pheric dynamics, and that these several storm-routes indicate, with 
much certainty and precision, the general or aggregated course 
of circulation pursued by the great currents or moving strata of 
the lower atmosphere, at the several periods and localities in 
which these storms have appeared. 
Some of these storms, however, have been traced only in their 
westerly course in the lower latitudes, and have not been followed 
in a subsequent northeasterly course ; but in these cases there 
appears no good reason to doubt the ultimate extension of the 
semi-orbital curve of the storm-path into higher latitudes. 
The storm-routes which have been established by the inquiries 
of Col. Rem, on both sides of the equator, constitute an impor- 
tant addition to our knowledge on this subject, and are found on 
of Calcutta, have also contributed much to our knowledge of the 
courses pursued by Asiatic storms.+ Other and distinguished 
writers have shown, to some extent and at different periods, a 
corresponding course in other tempests, while moving through a 
portion of the temperate latitudes, but with no clear indications 
of an orbital or semi-orbital course of progression in the body of 
the storm. - 
Antje’s Hurricane of August and September, 1842. 
Three several storms, the routes of which are marked I, Ifand 
V, on my storm chart of 1835, were traced only in their westerly 
* “ An attempt to develop the Law of Storms, by means of facts arranged according to 
place and time ;” by Lieut. Col. W. Rerp, C. B., F. R. 8. ; Weave, London, 1838 and 1841. 
i Law of Storms in India ;” published by Mr. 
PrpprneTon, at Calcutta. Mr P. infers that some storms of the China sea have probabl 
p southwesterly course ; but we can hardly admit this anomaly without full 
evidence derived solely from the progre 
Calities, 
ss of the storm over successive and extended lo- 
