449 
Plot F. Sprayed to solution arsenite of soda; 
,, G-. Treated tV solution arsenite of soda applied 
through carpet machine ; 
H. Changkolled and roots picked. 
Notes on Above. — Plots P and F were treated alike, 
they were sprayed on ten occasions and burnt over twice. 
' The effect of two sprayings was spoiled by ram com- 
ing on soon after the spraying was finished. The lalang 
appears to Have weakened in growth considerably, but looks 
as if it would still fake some time to kill out, and if left alone 
for a short time would again grow vigorously. 
Plot 0 shows verv little difference from 1> and I , but 
is if anv thing less affected by the treatment, it has been 
noted that if a shower of rain happens to come after spray- 
ing, the mixture has much less effect than in the case of 
those sprayed with the stronger solution. 
Plot I). — In this plot the ground was changkolled over 
on three occasions, in March, April and May, at a cost of 
$33.90 per acre, coolies being paid 35 cents per day. Alter 
three turnings the ground was practically clear of lalang 
and with ordinary weeding could have been kept clean. 
The ground was wet from July to December without 
anv attention whatever, it was then turned over once more 
at a cost of $9.80 per acre, the lalang even then was well in 
lldUC This apears to me to he the best and most practical 
means of eradicating this pestilent weed, not only are the 
weeds disturbed, but, in addition, the ground receives the 
benefit of cultivation. The cost would probably be verv 
considerably cheapened if large areas were treated and 
plough and harrow used in place of the ordinary changkol. 
Plot E. — The ground was changkolled over once, at a 
cost of $16.75 per acre, and then planted with the wild 
passion flower (Pamflom foetid"), the ground being high 
and somewhat dry at times; the growth of the passion 
flower was extremely slow and cannot be considered at ad 
a success. 
Plot F, see Plot B. 
Plot (F This plot was treated with one-tenth solution 
of arsenite of soda7applied as follows: 
A box containing the Solution, mounted on wheels, and 
a blanket saturated with the solution, with one end in the 
box, was dragged slowly over the grass m both directions. 
The device when tried on level ground acts very well and 
results in a considerable saving of solution. But for prac- 
i0 . 
