24 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



gated by He^ll•^ Pidiliugtoii, tojifther with tliost; whicb liiive been siinje investigated by Blautbrd, 

 Elliott, ami otliers. Column 1 gives the number oC reference; eoluum 2 shows the date of com- 

 meiiceiueut, so far as indicated by the published observatious ; coUinm 3 shows the latitude of the 

 storm's center when it first became violent; column 4 shows the average course of the storm while 

 advancing westward ; column 5 shows the velocity of progress in English statute miles per hour 



Table VI. — Observations of the wind from the charts of the U. S. Hydrographic Office- 



AUGUST. 



SEPTEMBER. 



OCTOBEB. 



wiiile moving westward ; column 6 shows the latitude at which the course of the storm became due 

 north ; column 7 shows the velocity while moving north ; ct)lainn 8 shows the average course of 

 the storm after turning eastward; column 9 shows the hourly velocity of progress while moving 

 eastward ; column 10 shows whether rain was mentioned as accompanying the storm, and whether 

 the rain fall was violent or not; column 11 indicates the name of the jierson by whom the phe- 

 nomena of the storm were investigated, and column 12 shows where the record of the investigation 

 may be found. 



37. It will be seen that 52 per cent, of these cases occurred in the months of September 

 October, and November, and 43 per cent, occurred in the months of April, May, and June, leaving 



