Am.  jour.  Pharm.  \       Plants  Used  as  Insecticides. 
January,  19 19.  -> 
27 
given  has  been  retained,  and  the  common  name  changed.  In  pre- 
paring this  list  the  object  has  been  to  name  the  plant  so  that  it  could 
be  identified,  rather  than  to  prepare  a  list  of  synonyms  or  a  botanical 
classification. 
The  author  will  greatly  appreciate  any  information  in  regard 
to  additional  plants  reputed  to  have  insecticidal2  action  and  also  in 
regard  to  tests  upon  insects  made  with  any  plants,  whether  listed 
here  or  not. 
The  author  wishes  to  acknowledge  his  indebtedness  to  Mr.  G.  L. 
Keenan,  of  the  Micro-chemical  Laboratory,  Bureau  of  Chemistry, 
who  has  very  kindly  aided  in  classifying  the  plants  as  to  family3  and 
in  correcting  typographical  errors. 
Achillea  nobilis  L.    Composite?.    Noble  Yarrow.    Central  and 
Southern  Europe. 
The  flower  heads  of  this  have  an  action  upon  insects  similar  tp 
that  of  insect-  powder.  (Gieseler,  Proc.  Am.  Pharm.  Assoc.,  Vol. 
10,  1862,  p.  112.) 
Adhatoda  Adhatoda  (L.)  Lyons.    Acanthacece.    Synonyms:  Ad- 
hatoda  vasica  Nees.,  Justicia  Adhatoda  L.   Malabar  Nut.  India. 
Fatal  to  flies,  fleas,  mosquitoes,  leeches,  the  pupae  of  aquatic  in- 
sects, and  even  to  frogs.    (Rusby,  Chemist  &  Druggist,  Vol.  34, 
June  15,  1889,  p.  831.) 
/Esculus  glabra  Willd.    /Esculaceae.    American  Horse-Chestnut, 
Ohio  Buckeye.   Eastern  U.  S. 
2  I  would  call  attention  to  the  meaning  of  the  term  "  Insecticide  "  as  de- 
fined in  the  Insecticide  Act  of  1910,  Sec.  6:  "That  the  term  'Insecticide'  as 
used  in  this  act  shall  include  any  substance  or  mixture  of  substances  intended 
to  be  used  for  preventing,  destroying,  repelling,  or  mitigating  any  insects 
which  may  infest  vegetation,  man  or  other  animals,  or  households,  or  be 
present  in  any  environment  whatsoever."  Regulation  14  of  "  Rules  and  Regu- 
lations for  Carrying  Out  the  Provisions  of  the  Insecticide  Act  of  1910" 
(U.  S.  Department  Agr.,  Office  of  the  Secretary,  Circ.  No.  34,  2d  revision, 
August  24,  1917,  pp.  5-6)  defines  an  insect  as  follows:  "The  term  'insect'  as 
used  in  the  act  and  these  regulations,  is  understood  to  mean  any  of  the  nu- 
merous small  invertebrate  animals  generally  having  the  body  more  or  less 
obviously  segmented,  for  the  most  part  belonging  to  the  class  Insecta,  com- 
prising six-legged,  usually  winged,  forms,  as  beetles,  bugs,  bees,  flies,  etc.,  and 
to  other  allied  classes  of  arthropods  whose  members  are  wingless  and  usually 
have  more  than  six  legs,  as  spiders,  mites,  ticks,  centipedes,  wood  lice,  etc." 
3  We  have  used  the  botanical  nomenclature  as  given  by  Britton  and 
Brown,  "The  Illustrated  Flora,"  1913  edition,  for  plants  native  to  this 
country,  and  the  "  Index  Kewensis  "  for  foreign  genera  and  species. 
