New Locality of the Infusorial Stratum in Virginia. 339 



ship should steer N. E., for she is in the northeastern part of the 

 storm; if it begin from the N. W. and change by W. to S.W., 

 steer towards the S. W., for the vessel is on the southwestern side 

 of the storm. 



3. In the southern part of the torrid zone : — If the wind set in 

 from the S. E. and alter by S. to S. W., the ship must steer N. W., 

 for she is on the northwestern side of the storm ; but if the gale 

 begin from E. and pass through N. to N. W., steer S. E., for the 

 vessel is on the southeastern side of the storm. 



4. In the southern temperate zone: — -If the gale set in from 

 the N. E. and veer by N. to N. W., steer towards the N. E. ; but 

 if it begin from the S. E. and change through S. towards S. W., 

 steer to the S. W., for in the first case the ship is on the north- 

 eastern, and in the second on the southwestern side of the storm. 



If our examination of storms of the temperate zone has pointed 

 to the hurricanes of the tropics as their source, we do not there- 

 fore conclude that causes originating these phenomena may not 

 also exist in the middle latitudes. The violent tempests of the 

 Black Sea and the Levant, which usually mark the beginning of 

 the rainy season in those regions, and which, on that account, 

 are called " Temporales," appear to owe their intensity to local 

 conditions. But we possess no detailed account of the direction 

 in which these storms move, and of the order of change in the 

 indications of the wind vane during their prevalence. The ab- 

 sence of such information in regard to seas so much frequented 

 is a remarkable circumstance, and is much to be regretted. 



[M. Dove concludes his memoir with a very interesting descrip- 

 tion of the effects of the storm of the 10th of October, 1780, which 

 it seems unnecessary to repeat to the English reader who has ac- 

 cess to Colonel Reid's work, from which it is taken.] 



Art. IX. — Notice of the discovery of a Neio Locality of the " In- 

 fusorial Stratum ;" by M. Tuomey. 



Since the brilliant discovery by Prof. Rogers, of the " infuso- 

 rial stratum" at Richmond and on the Rappahannock, the atten- 

 tion of students of geology must have been directed with new 

 interest to the beds of clay which form so conspicuous a feature 

 in our tertiary deposits. And although in the present state of 



