PLANT’ LICE. 187 
“Unlike the grain louse, we can here do very much more 
with insecticides, and indeed with care, can keep the insects com- 
pletely in check. One of the best of the remedies is the whale- 
oil soap of commerce. The kerosene emulsion is equally effective, 
and for penetrating power is even better. In all experiments 
made for me this season the result was uniform and the effect 
satisfactory. It will be enough to state that the fish-oil soap was 
perfectly effective at the rate of one pound of soap to eight gal- 
lons of water. Another very satisfactory remedy was found in 
ground tobacco. This was used with excellent result, put on 
early, while the plants were wet, and dusted on thoroughly. It 
has the great advantage of being a fertilizer as well as an insecti- 
cide, and one of my correspondents who made the experiment, 
Fic. 155—Aphis brassice Linn.—Winged, viviparous female. After Smith. 
writes May 18th: ‘I have no cabbage lice at present. I first 
commenced with the tobacco mixture, and after two or three ap- 
plications that row has done fine; they are now as large around 
as a truck basket.’ Regarding the whale-oil soap the same cor- 
respondent writes: ‘The whale-oil soap was put on another lot; 
the first application did not kill all of the lice, so the next day 
we put it on again as you directed, which has killed them all, 
and the cabbage is doing nicely. This is a sure remedy. I let 
some others have of it with the same result.’ We are therefore 
not without a remedy for this pest; but many complain that the 
