Am.  Jour.  Pharm. ) 
May,  1881.  J 
Dilatometer, 
225 
nor  the  patient,  and  is  almost  odorless.  For  exhibition  in  the  fluid, 
form  the  best  vehicles  are  alcohol,  glycerin  and  syrup  of  orange,  but 
it  is  preferably  administered  in  powder  inclosed  in  wafers  or  gelatin 
capsules,  whereby  its  peculiar  taste  is  completely  masked. 
It  is  stated  that  the  following  formulae  can  be  recommended  : 
R    Resorcini  puri,         .  .  .  •   gr.  viii 
Aqufe  destillat., .  .  .  . 
Syriipi  aurantii,       .  .  .  • 
M.    S.  A  tablespoonful  every  two  hours. 
For  an  emulsion : 
R    Resorcini  puri,       .  .  .  .   gr.  viii 
Amygdalae  dulcis,         .  .  .  ^v 
Syrupi  aurantii,     .  .  .  •  .^i 
M.    ft.  emulsio.^    Sig.  A  tablespoonful  every  two  hours. 
The  spray  should  be  made  thus : 
R    Eesorcini  puri,     ....    grs.  xviii 
Aquse  destillat.,         .  .  ,         Sviii.  M. 
DILATOMETEE. 
By  Gustavus  Pile. 
Head  at  the  Pharmaceutical  Meeting^  April  19. 
The  following  is  a  description  of  a  dilatometer  of  a  new  pattern,  and 
intended  mainlv  to  show  the  amount  of  the  dilatation  or  contraction 
of  a  liquid  as  the  temperature  is  either  increased  or  diminished.    It  is 
in  construction  similar  to  a  hydrometer,  having,  however,  a  very  large 
bulb  and  a  long  stem,  the  whole  instrument  being  some  twenty  inches 
in  length.    The  graduation  on  the  stem  is  so  made  that  each  degree 
represents  the  yoVo  P^^^  whole  volume  up  to  the  point  marked 
1,000,  which  is  placed  at  the  middle  of  the  stem.  The  scale  has  a 
range  of  60  degs.,  30  above  and  30  below  the  central  mark;  each  of 
these  is  sub-divided  into  quarters.  In  using  the  dilatometer  it  is  to  be 
floated  in  the  liquid  to  be  examined,  and  enough  shot  added  to  bring 
it  to  the  1,000  mark,  the  temperature  at  the  same  time  being  brought 
to  60°F.  If  now  the  temperature  be  increased  the  instrument  will 
sink  as  the  volume  of  the  liquid  increases,  and  by  observing  the  num- 
ber of  volumes  occupied  at  regular  intervals  of  increase  of  temperature 
a  table  of  expansion  can  readily  be  made;  so  also,  by  decreasing  the 
^It  would  seem  that  in  this  formula  aqu?e  f^iii  has  been  omitted,  for 
preparing  the  emulsion  and  making  the  dose  of  resorcin  =  gr.  i. 
15 
