122 Agricultural Education and Forestry Exhibition , 1905. 
appearance presented by the crop to which mineral super- 
phosphate at the rate of 5 cwt. per acre and sulphate of potash, 
1 cwt. per acre, had been applied. The crop was much more 
healthy and strong than on the untreated plot, this bearing 
out the conclusions that might have been drawn from a 
consideration of the analysis of the soil, which showed the land 
to be rather poor in respect of phosphoric acid and potash. 
4. Influence of Weeds . — A further series of pots showed 
how weeds influence the growth of a crop, and how they 
may serve as an index of the requirements of a soil. A set 
of six pots was filled with the light sandy loam of a plot of 
Stackyard Field, Woburn, this soil possessing an acid reaction. 
Barley was grown in all, but with three of the pots the weeds 
were allowed to grow undisturbed together with the barley, 
while from the other three pots the weeds were removed. In 
some cases lime at the rate of 1 ton per acre had been applied. 
Where, in the absence of weeding or use of lime, weeds and 
barley were allowed to grow together, the barley was nearly 
killed out, there being only a mass of spurry and knot grass ; 
where the weeds were removed, but no lime used, the barley 
was better, but the acid condition of the soil kept the crop from 
growing properly ; where lime had been put on but weeds not 
removed, the spurry had disappeared and the barley crop still 
further improved ; but where both weeding and lime applica- 
tion had been followed the barley was most vigorous. The 
presence of weeds like spurry, that thrive in an acid soil, may 
thus afford a guide' as to the proper treatment of the soil, viz., 
by liming. 
5. Inoculation Experiments . — That which created the 
greatest interest was the demonstration, through growing crops 
in pots and by photographs of the plants taken at various 
stages, of the result of treating leguminous crops with inocu- 
lating materials for the purpose of increasing their power of 
utilising the nitrogen of the atmosphere. Neither by the 
increased growth, nor by any perceptible increase in the 
“nodules” formed on the roots, could any marked benefit 
be seen at that stage of the experiments as accruing from the 
use of the inoculating media. The experiments are described 
in detail at page 211 of this Volume. 
Mr. H. M. Freear, Dr. Voelcker’s chemical assistant at the 
Woburn Pot-culture Station, was present during the whole 
of the time the Exhibition was open, and was most assiduous 
in explaining the nature of the exhibits to visitors, and in 
affording information as to the farm and its experimental work. 
Both Lord Moreton and myself desire cordially to acknow- 
ledge the valuable co-operation of all who contributed to the 
