Am.  Jour.  Pharm.  | 
May,  1883.  J 
Myrtus  Cheken. 
251 
black  color  with  ferric  salts,  a  bulky  precipitate  with  gelatin,  and  a 
precipitate  with  tartrated  antimony.  The  tannin  was  estimated  by 
Watts'  aluminated  gelatin  solution,  according  to  the  method  in 
"  Sutton's  Volumetric  Analysis,"  and  found  to  amount  to  4  per  cent. 
The  reserved  filtrate  (a)  was  treated  with  hydrogen  sulphide  in  the 
same  manner  as  above ;  the  acid  filtrate  was  concentrated ;  and  failing 
to  crystallize  when  set  aside,  it  was  neutralized  with  a  solution  of 
potassium  carbonate,  when  it  yielded  whitish  crystals,  grouped  in 
irregular  masses,  of  a  warm,  pungent  taste,  partially  soluble  in  alcohol., 
freely  so  in  dilute  alcohol,  and  insoluble  in  ether. 
7.  Estimation  of  Aqueous  Extracts. — Decoction:  100  gms.  of  perfectly 
dried  leaves  left  after  the  hydro-alcoholic  determination,  boiled  with 
water  in  a  porcelain-lined  vessel,  yielded  a  clear,  dark  brown  decoction,, 
having  no  odor,  and  by  appropriate  tests  showing  the  presence  of  gum,, 
starch,  coloring  and  extractive  matters.  Its  extract  amounted  to  4* 5 
per  cent. 
Infusion :  100  gms.  of  leaves  were  macerated  in  450  cc.  of  cold 
water.  The  infusion  was  of  a  light  brown  color,  of  the  aromatic 
peculiar  odor  of  the  leaves,  and  of  a  pleasant  slightly  astringent  taste. 
A  portion  boiled  remained  perfectly  clear,  and  mineral  acids  effected  no^ 
change. 
EECAPITULATION. 
STEMS. 
1.  Moisture  .10  per  cent. 
2.  Ash  4'84  per  cent,   chlorides,  phosphates,  sul- 
phates and  carbonates  of  potassium,  mag- 
nesium, calcium,  and  aluminium  ;  silica. 
3.  Volatile  principles  
4.  Benzin  extract  5*45  per  cent,  yellow  color,  fixed  oil,  fatty  acid.. 
5.  Alcoholic  extract  6*25  per  cent,  resin,  tannin,  extractive. 
6.  Hydro-alcoholic  extract  5*2  per  cent,  tannin,  organic  acid,  extractive... 
7.  Aqueous  extract  4-08  per  cent,  gum,  color. 
LEAVES. 
1.  Moisture  10  per  cent. 
2.  Ash   8'4  per  cent,  chlorides,  phosphates,  sul- 
phates and  carbonates  of  potassium,  mag- 
nesium, calcium,  and  aluminium  ;  silica. 
3.  Volatile  principles  Volatile  oil,  volatile  alkaloid. 
4.  Benzin  extract   5*3  per  cent,  yellow  color,  volatile  oil,  chlo- 
rophyll, fat,  wax. 
5.  Alcoholic  extract  10*2  per  cent,  resin,  tannin,  extractive. 
6.  Hydro-alcoholic  extract         6-25  per  cent,  tannin  (4  per  cent.),  organie 
acid,  color,  extractive. 
7.  Aqueous  extract   4-5  per  cent,  gum,  starch,  color,  extractive.- 
