44 SPRAYING OF CHARLOCK. 

has no effect on the ‘‘smooth-leaved” variety, so that the 
results at Madryn are in keeping with facts already known. 
‘+ On June 7th the Carnarvonshire centres were visited, and 
notes were made on the various plots. At Penrhyn all the 
dressings appeared at this time to have had some effect. 
More charlock had been injured on the copper sulphate plots 
than on those dressed with sulphate of iron. The most satis- 
factory plot at this date was Piot IV. 
At Tanyfynwent the copper sulphate solutions had had a 
decided effect on all the plots to which they were applied. 
Tne sulphate of iron, on the other hand, had had very little 
effect, though the stronger solution (Plot VI.) had been 
slightly more effective than the other. As far as could be 
seen at this date, none of the solutions had had an injurious 
influence on the corn at any of the centres. 
The centres were visited again on June 1oth. At this time 
it was observed at Penrhyn that on Plot I. the charlock 
leaves were very much shrivelled, and the flowers partly 
shrivelled. On Plot II. the leaves were also greatly 
shrivelled and the flowers only partly so, as on Plot l. Here | 
it was observed, further, that the corn was slightly tinged. 
A large part of the leaves’and flower was shrivelled on Plot 
Ill., and the corn was also tinged. On Plot 1V> theweaves 
were almost entirely shrivelled, and the flowers were con- . 
siderably damaged. The corn was tinged on this plot again. 
On Plot V., the charlock was not much affacted. The leaves 
were a good deal shrivelled on Plot VI., but the flowers were 
not touched. 
At Tanyfynwent, the leaves. and flowers were much 
shrivelled on Plot IIL, but on the other plots there was not 
very much to be noticed. The sulphate of iron appeared to 
have had little or no effect on the charlock. 
Up to this time the dressings had been more successful on 
the whole at Penrhyn than anywhere else, though the results 
here cannot be said to have been very satisfactory when com- 
pared with those obtained at other places where similar 
experiments had been conducted. On June 16th this centre 
was visited for the third time. It was estimated then that 
about 75 pér cent. of the charlock had been killed on Plot 
