Letter from Howard Walter Florey to Director, National Institutes of Health, Antibiotic Section, Bethesda, Maryland Believes Dr Arriagada has written to the Director - Arriagada wishes to work in USA but cannot do so because of financial difficulties - comments on this and on work done at Oxford on bacteria which Arriagada brought from Chile and which produce antibiotics - comments on Arriagada's work and personality - should do all they can to help South American countries - comments on this. 25 October 1947