474 
VARIETIES. 
the  clay  dried.  The  shellac  must  be  dissolved  in  the  mixed  turpentine 
and  spirit  with  a  little  warmth.  The  dried  clay  and  the  coloring  must  be 
now  well  blended  in  a  mortar,  and  then  the  shellac  mixture  added  and 
well  incorporated  till  the  whole  is  a  doughy  mass  :  it  is  then  to  be  rolled 
out  into  pencil  form  and  dried  witli  stove  heat.  To  make  the  crayons  of 
uniform  substance,  the  paste  may  be  placed  in  a  cylinder,  with  a  hole 
at  one  end  and  a  piston  at  the  other,  (like  a  boy's  pop  gun),  the  "  wormy'^ 
pieces  that  pass  through  are  then  cut  into  proper  lengths  and  dried, — Sep- 
timus Piesse. 
A  new  Caustic  for  Toothache. — The  following  treatment  is  recommended 
by  Dr.  Calvy,  of  Toulon,  for  the  neuralgia  proceeding  from  carious  teeth. 
The  carious  cavity  is  first  to  be  cleaned  out,  and  then  a  piece  of  cotton, 
steeped  in  a  solution  of  six  grains  of  acetate  of  morphia  in  an  ounce  of 
nitric  acid,  is  to  be  applied  to  its  interior.  As  soon  as  the  caustic  pene- 
trates into  the  carious  tooth,  the  pain  ceases,  and  the  patient  is  cured. 
After  the  application  of  the  caustic,  the  cavity  should  be  filled  with  cotton 
steeped  in  the  sedative  solution  of  opium,  and  afterwards  permanently 
plugged. — Br.  Med.  Journ.  from  Gaz.  des.  Hopitaux,  Jan.  10,  1861. 
Juice  of  Chelido Ilium  Majus  has  been  locally  applied  with  the  mf)st  satis- 
factory results  in  cases  of  greatly  itching  eczema,  injuries  from  nettles,  and 
other  itching  diseases  of  the  skin,  by  Grand-Clement  [Bull,  de  Therap. 
\\\.,  p.  33G).  Mixed  with  an  equal  quantity  of  glycerine,  it  can  be  pre- 
served and  used  for  the  same  purpose  at  times  when  the  fresh  plant  cannot 
be  obtained. — London  Pharm.  Journ.  July,  1860. 
Ferri  Carhonas  Effervescens :  a  New  Form  of  Chalybeate. — Dr.  T.  Skinner, 
in  a  communication  to  the  Dublin  Medical  Prest',  recommends  the  follow- 
ing formula  for  preparing  efiervescing  carbonate  of  iron  : — 
R    Acidi  Tart.,  5iij. 
Sodoe  Bicarbonatis,  ^v. 
Ferri  Sulph.,  3x. 
Pulv.  Sacchari,  Jj.  3vj. 
Acidi  Citrici,  ^ij. 
1.  Mix  the  sulphate  of  iron  with  the  sugar  and  part  of  the  tartaric  acid. 
2.  Mix  the  citric  acid  with  the  remainder  of  the  tartaric  acid  and  the  bi- 
carbonate of  soda.  3.  Add  the  mixtures,  and  thoroughly  incorporate 
them  by  sifting.  4.  The  whole  is  now  to  be  thrown  into  a  metallic  pan 
set  in  a  water-bath  ;  in  a  few  minutes  it  will  separate,  when  it  should  be 
rapidly  stirred  until  granules  are  formed.  If  preferred,  it  may  then  be 
flavored  with  oil  of  lemon  ;  hitherto,  however,  the  preparation  has  been 
without  it. 
When  the  above  is  carefully  prepared,  it  has  all  the  appearance  of  the 
popular  and  well  known  granular  effervescent  citrate  of  magnesia,  with  the 
