DURING RAIN OR SNOW. 241 



some degree, the preponderance of those which are properly the rainy 

 winds, the distribution of the winds, when no regard is had to the 

 amount of rain that fell in the day, and the distribution of the winds 

 when the total fall in the day Was equal to or exceeded half an inch, 

 have been shewn separately. 



Table I. shews the distribution of the winds among the different 

 points of the compass throughout days o^ rain. The process employed 

 in the computation will be understood by referring to the table itself. 



Column (I) contains the absolute number of hours that each wind 

 blew during the days in any part of which either heavy or light rain 

 occurred during the years 18.53 to 1859. Column (2) contains the 

 duration of each wind on days wherein the rain was equal to or ex- 

 ceeded half an inch. Column (3) gives the absolute number of hours 

 that each wind blew during the same seven years.* 



From the quotients, which are given in columa (4), we learn that of 

 1000 hours in which the wind blew from E.N.E. as many as 545 hours 

 belonged to days during some part of which rain fell ; but that of 1000 

 hours of north wind, only 248 were included in days of rain. Also 

 from column (5), obtained in a similar manner from columns (2) and 

 (3), it appears that of 1000 hours of wind from E.N.E. , 126 hours 

 were comprised in days on which the rain that fell was not less than 

 half an inch, and that only 14 hours in 1000 of W.S.W. winds occur- 

 red on days wherein the rain reached that amount. 



The comparative magnitudes of the numbers in column (4) are bet- 

 ter seen by aid of the ratios which they severally bear to their arith= 

 metic mean. These ratios, and the ratios similarly obtained from col- 

 umn (5), are given in columns (6) and (7). 



From column (6) it appears that during days in which rain fell to a 

 greater or less amount, the winds from N.E. through south to S.W. 

 had a duration above or not below the average duration of all winds, 

 and that winds from N.N.E through north to W.S.W. had a less than 

 average duration. It is also seen that the wind of most frequent 00= 

 currence is from E.N.E., and that of least frequent occurrence from 

 either north or N.N.W. 



When the heavier rains only are taken into account, the winds whose 

 relative durations are above the average, lie between N.E. and S.S.E. ; 



• The entries in these three columns are furnished from the hourly records made by Eob» 

 inson's Anemometer. 



