Public Parks. 67 



In the table on page 61, is shown the frequency of the wind from 

 the different points of the compass, the number of days in which the 

 winds prevailed, and the mortality that occurred on the days that 

 the winds blew from the respective directions. It must necessarily 

 be approximate, as the effect of the daily changes is not always 

 manifest, and the fact, that frequently when the observations were 

 made (three per day), the wind was from different directions, 

 necessitating the study of each day separately and connectedly ; 

 representing in figures, as near as possible, the effect of the different 

 winds on mortality. While there may be mistakes in single days, I 

 am satisfied that in the main they are correct. 



The following figures represent the average daily mortality for the 

 last thi'ee years, w^ien the wind prevailed from the different directions : 



N. N. E. E. S. E. S. S. W. W. N. W. 

 11.96 16.1S 11,13 18.59 13-35 13-35 12.25 13-94 

 It will be noticed that the daily mortality for 1866, while the 

 wind was from the north-east, was nearly as great as when it blew 

 from the south-east. This result was caused by the cholera, which 

 became epidemic in October. For four days, that is, from the 5th to 

 the 9th, the wind was from the south-west, and dry, with a mean 

 temperature of 65°. In the afternoon of the 9th, the wind changed 

 to the north-west, reducing the temperatiu'e to 59°, the mortality 

 increasing from 37 on the 6th, to 67 on the 9th. On the loth, the 

 wind changed to the north-east, with an increase of temperature of 

 3°, and the mortality reached 98 ; on the nth, the temperature was 

 4° lower, and the deaths reached 71 ; on the 12th, the temperature 

 rose 1°, and there w^ere 82 deaths ; on the 13th, the temperature rose 

 3° higher, and there were 73 deaths ; on the 14th, the wind changed 

 to the south-east in the morning, but veered again to north-east, when 

 there were 61 deaths ; the same occurred on the 15th, with a lowered 

 temperature of 4°, and 68 deaths; on the i6th, the wind changed 

 to the south-east, and there were 53 deaths; and on the 17th, the 

 wind changed to the south-west, and there were 43 deaths ; and from 

 this time the number gradually diminished. It will be seen that, for 

 four days in succession, the south-west wind prevailed ; and for foin* 

 days the north-east; and for two more, its influence was felt, with a 

 higher temperature than has since been observed for the same length 

 of time. On the loth, nth, and 12th, the motion of the air was 

 barely perceptible, and was saturated with moisture, to such an 

 extent as to partially obscure the sun, hanging over the city like a pall. 



