Letter from Howard Walter Florey to R Pautrizel, Bordeaux Says there are several cephalosporins - has been some publicity about cephalosporin C which is in short supply - cephalosporin N is the same as synnematin B - difficult to make - not produced on large sclae - is enclosing reprint about test of cephalosporin N on a person sensitive to penicillin - has no degradation products of penicillin or cephalosporin - if French firms cannot help suggests that Pautrizel should contact Distillers Company or Glaxo. 16 January 1960