MANURING. OF Ee Oil Ons: 
In the Yournal for September last (Vol. VI., p. 169) some 
account was given of the experiments carried out by certain 
agricultural colleges in the manuring of potatoes, the point 
more especially investigated being the value of artificial 
manures, whether alone or in combination with dung. 
Attention may now be usefully drawn to some further experi- 
ments made in the course of 1899 by the Durham College of 
Science* and the Agricultural Department of the Yorkshire 
College, Leeds.t 
The Durham College experiments were carried out under | 
the direction of Professor Somerville on ten farms in the 
county of Durham, of which four, however, for various 
reasons, gave results which were not considered comparable 
with the remainder. The experiments on the six other stations 
may, Dr. Somerville says, be considered entirely satisfactory, 
and the results as trustworthy as can be secured from a 
single season’s trial. 
The experimental area at each farm was divided into 
twelve plots, the first. four receiving various quantities of 
artificial manures, and the next five 12 tons dung with arti- 
ficials, the quantity of fertilising constituents present in the 
latter being, except on one plot, less than on the four where 
they were applied without dung. The tenth plot had 12 tons 
dung alone, the eleventh 18 tons dung with artificials, while 
the last was left entirely unmanured. The results from the 

“ County Councils of Cumberland, Durham, and Northumberland. Technical Edu. 
cation. Eighth Annual Report on Experiments with Crops and Stock. 
+t The Yorkshire College, Leeds, and the East and West Riding Joint Agricultura 
Council. Results of Experiments on Potato Growing, 1899. 
