162 MR. J. CURTIS ON THE FALL OF RAIN AT 
feet from the ground, and was situated in a garden on the 
south-east side of the town, and twenty yards distant from 
any house or elevated object.* Mr. Casartelli’s gauge was 
a funnel 5 inches in diameter, with a perpendicular rim 2 
inches high, the top of which was between two and three 
feet above the ground, and was situated on the south-east 
side of the town, ten yards distant from a house on two 
sides, and the same from a wall nine feet high on the two 
other sides. It will thus be seen that the gauges employed 
in registering these observations were all of the same con- 
struction, with very little difference in their distance from 
the ground, and that the places where they were registered 
were within one mile from each other. They are also of 
the kind now recommended by Mr. Glaisher, of the British 
Meteorological Society, as the best for taking observa- 
tions on the fall of rain. 
It may be well here to state that Dr. Dalton found Mr. 
Walker’s returns to exceed his own by about four inches 
in the year, and that on inspecting Mr. Walker’s gauge 
he had reason to think that the method of measuring the 
rain employed was not susceptible of sufficient accuracy, 
and on his suggesting the same to Mr. Walker, the latter 
seemed to acquiesce.t For this reason I have given the 
fall of rain as collected by Mr. Walker in a separate table, 
so as to enable me to give two averages, the one with his 
observations included and the other without. 
In Dr. Dalton’s observations the fall of rain in the 
months of March and April 1807, December 1809, and 
January and February 1810, are not given. To fill up 
these blanks, and make the tables complete, I have in- 
serted the average fall of rain in those months, so that 
I am enabled to give the mean and total for each month 
and year, and also the mean and total for each month and 
year during the entire series of seventy-two years. 
* See vol. iii. p. 195, second series, of the Society’s Memoirs. 
+ See Dr. Dalton’s remarks, vol. iii. p, 498, new series. 
