69 
with reference to this year, 1880, that the death rate is base'd 
upon an uncertain estimate of the population, and therefore 
may admit of material correction when correct returns of 
the population shall have been obtained. In four of the five 
years of low amounts of ozone, the zymotic death rate was 
above the average, and in the fifth slightly below; and in 
the four years of high amounts of ozone the rate was always 
below the average. 
During the five years of low amounts of ozone, the gross 
death rate was 12 -8 per cent greater than in the four years of 
high amounts of ozone ; the local death rate 10-9 per cent 
and the zymotic death rate 92*6 per cent greater. 
I have only to add that a comparison of the general re- 
sults of the observations of temperature, humidity of the 
air, direction of the wind, and rainfall, with the ozone results, 
shows that although these elements have sometimes an 
influence npon the amount of ozone during short periods, 
yet that, taking a period of a year, the opposite effects 
during the short periods so far neutralize each other that 
the mean amount of ozone for the year is not affected by 
them to any very sensible extent, so that we are fully 
entitled to conclude that the corrected amounts of ozone 
given above fairly represent the actual degree of purity of 
the air of Southport during the last nine years, and that 
variations in the actual amount of free ozone exercise a 
very sensible influence upon the state of the public health. 
The President exhibited to the meeting an iron key, a 
leaden seal of the Duchy of Lancaster, an ancient spoon, and 
a curious piece of lead with an old English alphabet on it, 
all found in digging the foundations for some new buildings 
on a piece of land lying between Hanging Bridge and 
Cateaton Street in Manchester. 
The land from Church Gates in Cateaton Street to the 
river Irwell on the west slopes gently, and the underlying 
