798 
]]lw  Invented  the  Tall  Percolator? 
Am.  Jour.  Pharm. 
November,  1920. 
times  its  small  diameter.  These  percolators  are,  therefore,  nearly 
cylindrical."  This  latter  quotation  proves  that  Dr.  Oldberg  him- 
self did  not  apply  the  name  "cylindrical  percolator"  to  this  type  and 
recognized  that  they  were  not  cylindrical. 
It  is  not  the  writer's  purpose  to  detract  in  the  least  from  the 
credit  due  to  Dr.  Oldberg  for  formulating  this  rule  for  standard 
percolators  of  this  t3^pe,  nor  even  to  intimate  that  he  personally 
was  responsible  for  the  attaching  of  his  name  to  this  type  of  per- 
colator. However,  when  a  critic  studies,  in  the  Proceedings  of  the 
American  Pharmaceutical  Association  for  1879,  the  "Second  Report 
on  Fluid  Extracts,"  by  Prof.  C.  Lewis  Diehl,  he  is  forced  to  conclude 
that  Dr.  Oldberg  had  full  knowledge  of  this  contribution  and 
followed  in  his  paper  the  arguments  advanced  five  years  prior  by 
Prof.  Diehl. 
In    this    communication    Prof.     Diehl    was     presenting  his 
The  Diehl  percolator  as  described  in  1879. 
