360 OBSERVATIONS ON GUANO 
and their consequent cheapness, an estimate of 3s. 
per load, is nearer their average marketable price. 
This would require above 333 loads to produce 
that amount, or 84,000lbs. 
Three statute acres, constitute 1 acre, 3R. 16p. 
Irish. It is most likely the sum above mentioned 
is for the produce of an Irish acre. 
I have been informed, that near Nantwich in 
Cheshire, in a very favourable season, that a sta- 
tute acre has produced one load in every 70 linear 
yards, equal to 28,476lbs. or 113 loads, or, 122 
tons nearly. 
The weight of a potatoe crop, is stated by pro- 
fessor Low (Treatise on Agriculture, 1843,) to be 
in Great Britain generally, per statute acre, 
17,920lbs., or 8 tons. In nine agricultural districts 
in Ireland, Mr. Wakefield states, in 1812, the 
average to be 13,669lbs, or about 6 tons; while 
professor Johnston (Lectures on Agricultural 
chemistry and Geology) estimates an average 
crop at 13,440lbs., or 6 tons, and the maximum 
67,200lbs. or 30 tons. Dr. Daubeny states it at 
13,000lbs. or 6 tons. 
