36 
Plants  Used  as  Insecticides.       (A™-  J°ur-  Ptarm. 
*■    January,  19 19. 
Dasytoma  flava  (L.)  Wood.  ScropJuilariacece.  Synonym:  Ger- 
ardia  flava  L.  and  Ell.  Sk. 
This  plant,  it  is  said,  will  prevent  the  attacks  of  yellow  and  other 
flies  upon  horses.  (Porcher.) 
Datura  Stramonium  L.  Solanacecc.  Jimson-weed,  Jamestown 
Weed.    A  cosmopolitan  weed. 
No  result  upon  cotton  worms  (Aletia)  was  observed  from  the 
application  of  the  alcoholic  extract  of  the  dried  and  ground  seed  or 
the  alcoholic  extract  and  decoction  from  leaves.  (Riley.) 
Delphinium  Ajacis  L.    Ranuncidacece.    Common  garden  lark- 
spur.   Southern  Europe  and  cult,  in  gardens. 
Listed  as  an  insecticide  by  Greshoft. 
Delphinium  Brunonianum  Royle. 
Juice  used  to  destroy  ticks  in  animals.  (Pharmacogr.  Ind., 
quoted  by  GreshofL) 
Delphinium  coeruleum  Jacq. 
Roots  used  to  kill  maggots.  (Pharmacogr.  Ind.,  quoted  by 
GreshofL)  .  . 
Delphinium  Consolida  L.  Field  Larkspur.  Central  Europe,  cult, 
in  gardens  and  adv.  in  U.  S. 
"A  tincture,  prepared  by  infusing  an  ounce  of  the  seeds  in  a 
pint  of  alcohol  .  .  .  kills  lice  on  the  human  head."  (Williams, 
Trans.  Am.  Med.  Assoc.,  Vol.  2,  1849,  P-  875.) 
"  My  friend,  Dr.  Carmichael,  of  Fredericksburg,  Va.,  informs 
me  that  the  tincture  of  the  plant  is  destructive  to  insects,  and  use- 
fully applied  to  the  heads  of  children  infested  with  them." 
(Porcher.) 
"  I  have  found  the  common  larkspur  an  effective  poison  on  in- 
sects."   (Correspondent  in  Mississippi  to  Riley.) 
Delphinium  Staphisagria  L.  Synonyms :  Staphisagria  macro- 
car  pa  Spach.,  Delphinium  officinale  Wenderoth.  Lousewort. 
Mediterranean  basin.  Pliny  mentions  the  use  of  the  powdered 
seeds  for  destroying  vermin  on  the  head.  (Porcher.) 
Derris  elliptica  Benth.  Legummosco.  Malayan  Fish  Poison. 
Aker  Tuba. 
"  It  is  used  largely  by  the  Chinese  market  gardeners  as  an  insec- 
ticide, for  which  purpose  the  fresh  roots  are  chopped  up  fine  and 
