68 
It appears, therefore, from the numbers in the last column 
of the above table, that when allowance is made for the 
velocity of the wind, the mean amount of free ozone in a 
given volume of the air in Southport— say, for instance, the 
average quantity that enters into the lungs of a healthy 
person during a day — was least in 1875, and greatest in 
1879 ; and that in each of the five years 1872 — 1876 the 
mean amount was below the average for the nine years, 
while in the four years 1877 — 1880, during which consider- 
able improvements in the sanitary condition of the borough 
have been made, the mean amount has been much above 
the average. 
Comparing now the corrected annual amounts of ozone 
with the death rates of the borough, we have the following 
results : 
Corrected 
Gross 
Local 
Zymotic 
Year. 
Amount of 
Death 
Death 
Death 
Ozone. 
Kate. 
Rate. 
Rate. 
1872 
480 
,. 22-82 ... 
... 18-06 ... 
.... 206 
1873 
. 4-85 
,. 22-03 ... 
.... 3-74 
1874 
,. 4-45 
,. 22-14 ... 
... 18-42 .. 
.... 3-11 
1875 
4-17 
22-37 ... 
... 19-28 ... 
.... 2-64 
1876 
4-43 
.. 2106 ... 
... 17-63 ... 
.... 2-82 
1877 
5-60 
.. 19*75 ... 
... 16-42 ... 
.... 1-69 
1878 
5-82 
,. 19-71 ... 
... 16-35 ... 
.... 2-13 
1879 
.. 6-19 
.. 18-09 ... 
... 15-48 ... 
.... 0-73 
1880 
5-83 
.. 20-73 ... 
... 18-35 .. 
.... 1-43 
Means ,, 
513 
.. 20-97 ... 
... 17-65 ,. 
.... 2-26 
An examination of the numbers in this table shows that 
in the five years 1872 — 1876, when the mean amount of 
ozone was always below the average for the nine years, the 
gross death rate was always above the average, while in the 
four years 1877—1880, when the mean amount of ozone 
was always above the average, the gross death rate was 
always below the average. In four of the five years of 
lowest amount of ozone, the local death rate was above the 
average, and in the fifth year it was almost exactly the 
average ; while in three of the four years of highest amount 
of ozone, the local death rate was below the average, but in 
the fourth it was above. It must, however, be remarked, 
