﻿Smithsonian 
  Report. 
  1943. 
  Weintraul: 
  

  

  PLATE 
  1 
  

  

  

  1 
  Photomicrograph 
  of 
  crystals 
  of 
  gramicidin. 
  X225. 
  2. 
  Photomicrograph 
  of 
  crystals 
  of 
  tyrocidine 
  hydro- 
  

   chloride. 
  X320. 
  

   (From 
  Dubos 
  and 
  Hotchkiss, 
  Trans, 
  and 
  Stud. 
  Coll. 
  Physicians, 
  Philadelphia, 
  April 
  1942.) 
  

  

  