AFebSary,Pih9ar9m"  >  Hyoscyamus  Niger.  73 
TABLE  IV. 
Effect  of  Various  Fertilizers  upon  the  Growth  of  Hyoscyamus  niger. 
Pot  No 
... 
r  ertilizer  JL  reatment 
Wt.  of  Dry  Ma- 
terial in  vjms. 
Average  Wt. 
in  Gms. 
801 
No  fertilizer 
1.0 
802 
i-7 
6  03 
i-7 
1 .00 
004 
Complete  fertilizer* 
2.1 
805 
2.3 
oOO 
4.2 
2.80 
807 
Complete — Ca(H2PC>4,l22H2L) 
1.9 
808 
0.9 
809 
0-5 
1. 10 
8lO 
Complete — K2SO4 
2.2 
811 
3-1 
812 
2.2 
2.50 
813 
Complete — NaNo3 
2.1 
814 
2.3 
.  815 
1.7 
2.00 
8l6 
Complete — CaCo^ 
2.7 
817 
1.2 
8l8 
2.3 
2.20 
*  Complete  fertilizer  represents  1,000  lbs.  CaC03,  800  lbs.  CaCHoPOJ^ELO, 
400  lbs.  K2SOi,  600  lbs.  NaN03,  and  100  lbs.  MgS04  per  acre. 
Applying  a  complete  fertilizer  to  this  soil  greatly  increased  the 
yield  of  Hyoscyamus  niger,  as  seen  in  comparing  the  weights  of 
plants  of  pots  nos.  804,  805  and  806  with  801,  802  and  803.  Calcium 
phosphate  seems  to  be  the  most  necessary  fertilizer  required  for  the 
maximum  growth  of  this  plant  as  seen  in  determinations  807,  808 
and  809.  With  this  soil  K2S04  seemed  to  be  the  least  necessary 
for  the  maximum  growth  of  the  plant.  Likewise,  the  absence  of  cal- 
cium carbonate  did  not  result  in  materially  reducing  the  yield  of 
Hyoscyamus  niger  than  where  it  wa9  supplied. 
Control  of  Insects. 
In  the  cultivation  of  Hyoscyamus  niger,  the  principal  factor  to  be 
considered  is  the  control  against  the  attack  of  chewing  insects. 
Stockberger  (9)  summarizes  as  follows :  "  the  leaves  of  henbane 
usually  suffer  severely  from  the  attack  of  the  potato  beetle,  espe- 
cially during  the  first  year,  and  the  crop  is  very  likely  to  be  de- 
stroyed if  grown  within  range  of  this  insect."  Newcomb  and 
Haynes  (8)  state  that  hyoscyamus  is  very  susceptible  to  the  attack' 
of  the  Colorado  potato  beetle,  but  conclude  that  these  may  readily 
be  controlled  by  early  application  of  Paris  green  or  other  arsenical 
