-196- 
DUBOISIA HOPWOODII F. Muall. Pltur; 
This species is often mentioned in- papers on nicotine although 
only one paper on noraiootine obtained from this tree was found* 
A sample of d-nornicotine, obtained from this plant in Australia, 
was found to hare about the save toxicity to the bean aphid as the 1- 
snd dl-nornioetines. Bxtracta of thi? species night yield an insecti- 
cide superior to nicotine against some ins ?ta.— Hansberry and Norton 
(182 ), sad Hiohardson ( 521 , p. 83) . 
HTOSCIaUDS ALBUS L. 
A deooetion was recommended as an insecticide in Germany.— Sprenger 
(573). 
HY0SCYAMT8 NIGER L. Henbane* 
A deooetion was reooraDended against aphids on rose bushes •— 
Binnenthal (67, p* 46)* 
A deooetion was reoommended as an insecticide in Germany. — Sprenger 
(373). 
A strong deooetion was effectire against aphids only. — Sohreiber 
(360). 
A deooetion was inefficient against two species of oaterpillars 
but efficient against a third species*— Goriainov ( 166 ). 
A 10-peroent water extract and folia hyoscyasd. had no effect on the 
oaterpillars of Prodenla 11 turn (F.).— DeBussy (76)* 
The minimum concentration of hyosoyamine sulfate required to kill 
about 96 percent of bean aphids was greater than 0*4 go. to 100 oo* 
of liquid, while that of niootine sulfate was 0.009 go. — Richardson and 
Saith ( 322 ). £ Hyosoyamine is an alkaloid obtained from henbane, bella- 
donna, and Jiosonweed.J 
Extracts applied as sprays against adult mosquitoes were much in- 
ferior to the standard mosquito cide*— Wats and Singh ( 421 ). 
BTOSCYAlftJS spp. 
Extracts were tested against four species of oaterpillars. Within 
7 days a 6-peroent spray killed only 20 peroent of the insects and a 
1-peroent spray only 16 peroent. — Duke of Bedford and Pickering ( 63 , 
p. 84). 
Conmerolally prepared extracts were not significantly toxlo to 
the bean aphid*— Tattersfi eld and ooworkers ( 393 )* 
