8 BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 
against Myzus persicae, Macrosiphwm sp. (7, silkworms, and the 
lady-beetle tested, but inefficient against webworms and small tent 
caterpillars. 
The alcoholic and benzene extracts of derris, when sufficiently 
strong and used with soap or kerosene emulsion, were found efficient 
against many species of aphids (Tables 4 to 6). The alcoholic ex- 
tract, used with soap, was efficient against half-grown sawfly larvae, 
but inefficient against small webworms (first instar) and the larvae 
and adults of potato beetles. 
At Tallulah, La., a commercial preparation of powdered derris 
was used on three dogs which were infested with fleas (Ctenocephalus 
canis Curt.). It was found efficient against the fleas. 
SANDBOXTREE. 
None of the six preparations of the sandboxtree (Hura crepitans) 
sprayed on aphids proved efficient (Table 8). A 10 per cent and a 
20 per cent sap killed most of the aphids tested within three days, 
but this reaction time is entirely too slow for practical purposes, 
and even the sap 5 per cent and 10 per cent mixed with soap was 
inefficient. The alcoholic extracts of the bark and sawdust were 
inefficient, but the extract of the bark seems promising, and probably 
a stronger mixture would have been efficient. 
i 
TOMATO VINES. 
Powders from tomato vines (Lycopersicum esculcntum), applied 
as dusts, were ineffective on webworms, silkworms, potato-beetle 
larvae, rose aphids, and tent caterpillars, but they had a considerable 
effect on roaches; mixed with food, they had a slight effect on 
grasshoppers and roaches and seemed efficient against flies (No. 11, 
Table 1). Used as a fumigant, the powder was practically ineffective 
against Myzus persicae. 
The water extracts from tomato vines had practically no effect 
on bees and tent caterpillars, but affected grasshoppers and flies con- 
siderably. The alcoholic and ether extracts were very effective on 
flies and bees. 
CHINABERRY. 
The hot-water extract of the berries of the chinaberry ( Mi lia azeda- 
rack) and also of the undried berries was efficient against bees and 
had a slight effect on roaches. The powdered leaves and water ex- 
tracts (not filtered) from this powder were efficient against silk- 
worms, hut had only a slight effect on Aphis spp. A and B (Xos. 
23k and 301a, Tables 2 and 3), and on tent caterpillars. 
The alcoholic, ether, and petroleum-ether extracts of chinaberry 
were fatal to bees; hut a strong alcoholic extract did not kill any 
of the silkworm- tested. The alcoholic and benzene extracts (Noa 
505 and 514, Table 4), used with soap were inefficient against Aphis 
spp. A and //, Macrosiphum sp. A, and M. I'uiodendri. 
TOBACCO. 
The results obtained by using common tobacco (Xicotiana tabacum) 
in the form of nicotine resinate and sulphate are as follows: About 
90 per cent of the chrysanthemum aphids and 98 per cent of the nas- 
