26 
Alum . — September 26, dusted pulverized alum on cabbages where 
worms and Aphides were abundant. Up to October 1 no effect was 
noted on either. September 26, it was applied in solution to them, but 
no signs of injury to either worms or Aphides were observed. October 
6, applied to cabbages on which worms were plenty. October 7, worms 
as healthy and numerous as ever. 
Kerosene in Ashes . — On October 4, applied this mixture to cabbage 
plants on which worms and Aphides were plenty, and watched for 
some time to see the effect. Could not find any worms killed by the ap- 
plication, though many were seen with the oily particles in contact with 
them on the leaves or adhering to their hairs. On subsequent days no 
decrease in numbers could be noted as a result of this application. 
Aphides w ere killed in some instances, but their position under leaves 
made it very difficult to dust them. The worms (P. rapce) seem to be 
protected by their hairy covering, which prevents the particles from 
coming in direct contact with the skin, and renders the spreading of the 
oil less effective. The worms with smooth skin might be killed more 
readily, but they were not plenty enough on the plants treated to enable 
me to arrive at any positive conclusion. 
Kerosene in Gypsum . — Applied on October 4, the gypsum containing 
as much kerosene as possible while allowing it to be dusted on the plants. 
The results were the same as followed the use of ashes, but I found it 
more difficult to mix and apply. There was a constant tendency to form 
lumps too large to be dusted on the plants, and unless quite fine the par- 
ticles will simply roll off the leaves. 
Kerosene in Sawdust . — Sawdust thoroughly saturated with kerosene 
was applied, October 17, to a number of plants on which cabbage worms 
were but moderately plenty. They were watched for nearly two hours, 
without any marked result. Unfortunately, I was prevented from 
making any further observations for several days, and in the meantime 
some severe frosts, the ravages of disease, and the maturing of the worms, 
left scarcely a living worm to be found even on plants not treated. 
Tomato -vine Inf usion. — Applied, October 7, to 18 cabbage plants infest- 
ed with cabbage worms. The plants were thoroughly drenched with the 
infusion, and many of the worms were well soaked in it without appar- 
ent inconvenience to them. On the following day the plants thus treat- 
ed were as badly infested as before and the worms were all vigorously 
feeding. 
