*m'4%b?;l$£rm}  Analysts  of  Pycnanthemum  Ldnceolatum.  67 
alcohol,  and  the  dark  green  solution  filtered  while  hot.  The  resi- 
due left  undissolved  consisted  mainly  of  a  dark  green,  rather  soft 
and  somewhat  elastic  substance,  soluble  in  chloroform,  resembling 
caoutchouc ;  partly,  also,  of  a  grayish  green  substance  of  different 
consistency,  perhaps  difficultly  soluble  in  hot  alcohol,  as  the  alcoholic 
filtrate,  on  cooling,  deposited  a  little  of  a  substance  similar  in 
appearance  and  possibly  identical.  Besides  this  substance,  the  alco- 
holic solution,  after  the  evaporation  of  the  larger  part  of  the  solvent, 
deposited  a  dark  green  substance,  leaving  the  supernatant  fluid 
almost  colorless.  The  whole  of  this  alcoholic  extract  was  finally 
dried  and  weighed. 
The  ether  extract  left  on  evaporation  a  dark  green  residue,  which 
was  dried  and  weighed.  It  was  subsequently  treated  with  acidified 
water,  slightly  warm,  and  the  filtered  liquid  tested  for  alkaloids  and 
glucosides,  with  negative  results.  The  residue,  after  the  treatment 
with  acidified  water,  was  treated  with  alcohol,  which  partly  dissolved 
it,  forming  a  dark  green  solution,  and  leaving  undissolved  a  dark 
green  residue. 
The  alcohol  extract  left  a  yellow-brown  residue  on  evaporation. 
It  was  treated,  after  drying  and  weighing,  with  cold  water,  with 
which  it  formed  a  turbid  mixture  extremely  difficult  to  filter.  A 
small  quantity  of  tolerably  clear  filtrate,  which  was  acid  to  litmus, 
gave  the  following  reactions : 
With  solution  of  ferric  chloride,  and  solutions  of  ferric  chloride 
and  ferrous  sulphate,  mixed,  dark  brown  precipitates,  perhaps 
slightly  greenish  ;  no  inky  coloration. 
With  potassio-mercuric  iodide  solution;  no  precipitate. 
The  aqueous  extract  was  yellow-brown  in  color,  slightly  acid  to 
litmus.  Total  organic  matter  was  estimated  by  evaporating 
one-tenth  (25  cc.)  to  dryness,  and  weighing  ;  the  ash  was  then 
estimated,  and  its  weight  deducted.  This  ash  was  found  to 
contain  considerable  phosphoric  acid.  The  mucilage  was 
estimated  in  25  cc,  by  precipitation  with  two  volumes  of  alcohol. 
After  drying  and  weighing,  the  ash  was  estimated  and  deducted. 
It  amounted  to  a  trifle  over  21  per  cent,  of  the  entire  precipitate. 
To  100  cc.  was  added  an  excess  of  lead  acetate  solution,  the  pre- 
cipitate filtered  off  and  washed,  the  filtrate  and  washings  freed  from 
lead  with  hydrogen  sulphide,  and,  after  driving  off  the  excess  of 
hydrogen  sulphide  by  heating,  the  fluid  was  divided  into  two  equal 
