999 
PRESERVATION  OF  LEECHES. 
eribed  in  this  city  ;  the  following  formulae  are  translated  from 
Dorvault's  officine,  page  239.    Three  strengths  are  indicated. 
No.  l.       No.  2.       No.  3 
Take  of  Solution  of  ammonia  (22°)  60  parts  80  parts  100  parts 
Tincture  of  camphor,         10    "     10    "     10  " 
Common  salt,  60    "     60    "     60  " 
Water  1000    "  1000    "  1000  « 
Dissolve  the  common  salt  in  the  water,  then  mix  the  camphor 
and  ammonia  together,  and  add  them  to  the  saline  solution.  M. 
Raspail  intends  No.  1  for  persons  whose  skin  is  easily  affected 
by  rubefacients  ;  No.  2  for  the  allaying  the  pain  from  the  sting 
of  insects,  and  No.  3  for  those  patients  who  have  a  hard,  callous 
skin.  It  is  employed  in  hemicrania,  cerebral  congestion,  and 
rheumatic  affections.  It  is  applied  by  compresses  to  the  part 
affected,  and  when  near  the  eyes  care  should  be  extended  to  pro- 
tect them. 
OX  THE  CONSTRUCTION  AND  MANAGEMENT  OF  AQUARIA  FOR 
THE  PRESERVATION  OF  LEECHES. 
By  Mr.  Alfred  Allciiix. 
Having  received  a  great  many  applications  for  particulars  re- 
specting the  Leech  conservatory,  which  I  exhibited  at  the  last 
Conversazione  held  at  this  Institution,  I  am  induced  to  offer 
the  following  suggestions  to  those  who  are  desirous  of  adopt- 
ing that  method  of  keeping  leeches  : — ■ 
A  vessel,  eighteen  inches  long,  twelve  inches  wide,  and  ten 
inches  deep,  will  be  found  to  be  of  a  size  suitable  for  the  preser- 
vation of  any  number  of  leeches  not  exceeding  two  hundred. 
This  vessel  may  be  made  of  slate  and  glass,  or  the  slate  may  be 
replaced  by  wood  lined  with  zinc,  and  the  latter  has  the  advan- 
tage of  being  cheaper  and  more  portable  than  slate.  I  have 
found  the  following  arrangement  to  answer  the  purpose  well. 
The  frame-work,  together  with  the  bottom  and  two  ends,  are 
made  of  birch-wood,  and  the  top  and  two  sides  of  glass.  The 
inner  surface  of  the  wood,  which  otherwise  would  be  exposed  to 
the  water,  is  covered  with  thin  zinc,  the  metal  being  turned  at 
the  edges  into  the  grooves  prepared  for  the  reception  of  the 
glass-plates,  and  fixed  there  with  the  cement  by  which  the  whole 
is  united.  The  cement  commonly  used  being  composed  of  a  mix. 
