246 
Myiius  CheJcen. 
(  Am  .'Jour.  Pharnj_ 
\      May,  1883. 
cream  to  rise.  Note  the  quantity  on  each,  and  if  the  amount  is  less 
on  the  sample  tested  than  on  the  other  it  indicates  dilution  or  skimmed 
milk.  Now  remove  the  cream  from  each  and  introduce  the  lactometer 
in  the  one  containing  the  pure  milk  and  note  the  mark  on  the  scale 
where  it  floats.  Then  remove  it  to  the  other  jar  and  note  also  where 
it  floats.  If  it  sinks  lower  than  the  first  it  is  evidence  of  dilution^ 
Replace  the  lactometer  in  the  jar  of  pure  milk,  and  from  the  per  cent- 
glass  filled  with  water  exactly  to  the  line  marked  0,  pour  into  it 
enough  water  to  cause  the  lactometer  to  sink  to  the  same  mark  as  that 
shown  by  the  diluted  milk.  By  reading  off  the  amount  of  water  used 
the  exact  percentage  of  dilution  will  be  seen. 
It  has  been  asserted  that  more  cream  will  rise  from  milk  that  has- 
been  slightly  diluted  than  from  the  pure  article,  but  after  repeated 
trials  with  varied  amounts  of  water,  ranging  from  10  to  25  per  cent.^ 
I  have  seen  no  such  result,  but  the  ratio  always  remains  about  the- 
same.  I  have  noticed,  hoAvever,  that  there  is  considerable  difference  iih 
the  time  required  for  the  separation  to  take  place. 
MYRTUS  CHEKEN. 
By  Joseph  Winters  England,  Ph.Gt. 
From  an  Inaugural  Essay. 
The  author  refers  to  the  characters  of  the  myrtacese  in  general,  and. 
to  the  botanical  relations  and  histological  characters  of  the  shrub  in 
question,  citing  among  others,  the  accounts  on  this  subject  given  by  Mr... 
E.  M.  Holmes,  "Pharmaceutical  Journal/'  February,  1879,  Prof.  Asa^ 
Gray  (U.  S.  Exploring  Expedition,  p.  510),  Mr.  J.  Hoehn  (see  p.  253)^, 
and  Dr.  J.  Moeller    Am.  Jour.  Phar.,"  1882,  p.  461.    The  essay  was- 
accompanied  by  various  drawings,  and  by  specimens  of  the  products, 
obtained  by  the  following  chemical  examination  : ' 
The  relative  proportion  of  stems  and  leaves  to  each  other,  by  weight,,, 
was  as  1  to  1*84.  Two  separate  analyses  were  made,  one  of  the  stems, 
the  other  of  the  leaves. 
ANALYSIS  OF  STEMS. 
1.  Estimation  of  Moisture. — 10  gms.  of  stems  in  a  moderately  fine 
powder  were  placed  in  a  drying  chamber,  and  kept  at  110°  C.  until  all 
moisture  was  driven  off;  the  loss  amounted  to  1  gm.,  or  10  per  cent. 
2.  Estimation  of  Ash. — 2*89  gms.  of  stems,  in  a  moderately  fine 
powder  were  incinerated,  the  weight  of  ash  was  0' 14  gm.  or  4*84  per 
