524 
A  New  Diaphragm. 
/Am.  Jour.  Pharm. 
\  November,  1894. 
addition  a  judicious  handling  of  the  mirror.  It  has  been  pointed 
out  that  an  "  Iris  "  diaphragm  should  be  attached  to  it.  True !  But 
then  we  cannot  have  everything.  There  is,  however,  nothing  to 
hinder  anybody  from  adding  an  additional  sleeve  suitable  to  take 
the  "  Iris,"  replacing  the  small  hole,  but  it  is  hardly  necessary. 
This  diaphragm  is  a  handy  one,  aside  from  the  convenience,  sav- 
ing an  outlay  of  $15  to  $25,  if  the  ordinary  accessories  had  to  be 
used ;  the  details  may  be  improved,  however. 
It  can  be  added  to  any  microscope,  and  it  is  not  absolutely  neces- 
sary to  get  an  optician;  any  pattern-maker  can  make  the  brass  parts. 
It  is  not  patented. 
