CONTRIBUTIONS TO METEOEOLOGY. 

 Table XIX. — Areas of low pressure, Nos. 2, 5, 8, and 20. 



37 



54. It sometimes happens that storms originating within the torrid zone, or within two or 

 three degrees of it, and south of the United States, pursue a course of nearly 1,000 miles almost 

 directly towards the uortli. while others pursue a very direct course towards the northeast. Table 

 XX shows cases in which storms have traveled northward and eastward, and came from a i)oint 

 as far south as latitude 20°. The arrangement of the table is similar to that of Table XVIII. 

 Columns 3 and 4 show the position of the storm ceuter at tlie beginning and end of the northeast- 

 erly motion, as far as is indicated by the observations ; column 5 shows the prevalent direction of 

 the storm's progress; column 6 shows the average velocity of its progress in miles per hour; column 

 7 shows the lowest pressure reported, and column 8 gives a brief indication of the previous course 

 of the storm. On Plate XIV these tracks are delineated, and are designated by the same numliers 

 as in the table. 



