66 Winifred E. Brenchley . 
At harvest time, July 30th, labour was short on account of the 
war, so again it was not possible to have the roots extricated from 
the soil. For the sake of accuracy the plants were pulled up (not 
merely cut), the roots were then cut off and returned to the pots, 
the shoots being dried and weighed. The wheat was far from 
mature. No ears had yet been produced, as the crop had been 
sown too late to allow for full development. For this reason the 
balance of opportunity was on the side of the weeds, so that any 
action of weed on wheat was considerably exaggerated in com¬ 
parison with what actually takes place in the field; for the 
elucidation of the problem under consideration this is a distinct 
advantage. 
Woburn Soil. 
TOTAL DRY WEIGHTS OF CROPS FROM SIX POTS. 
Crop. 
Weed. 
Grams. 
Grams. 
Papaver 
46.7 (5 pots) 
Papaver+ Papaver 
54.9 (5 pots) 
25.8 
Wheat + Papaver 
16.9 
41.1 
Wheat 
40.1 
Wheat + Wheat 
10.0 
Wheat + Spergula 
62.2 
Spergula +Spergula 
86.9 
Spergula 
70.5 
AVERAGE DRY WEIGHTS OF SHOOTS. 
Crop. 
Weed. 
Per 
plant. 
Per sin 
gle sowing. 
Per single sowing. 
Grams. 
Grams. 
Grams. 
Papaver 
9.34 
Papaver + Papaver 
5.49 
1.08 
4.3 
W heat + Papaver 
2.82 
1.71 
6.85 
Wheat 
0.835 
3.34 
Wheat + Wheat 
0.42 
1.67 
Wheat 
Spergula 
10.37 
Spergula + Spergula 
7.24 
Spergula 
11.75 
Wheat and Papaver. 
For the first month the wheat made good progress, and 
looked much the same in all cases, whether with single or double 
