CONTENTS. 
Page. 
1. Introduction 7 
2. Chemistry of digitalis 7 
3. Relationship of digitoxin content to physiological activity 8 
4. Variability of digitalis preparations 10 
5. Literature relating to standardization methods 16 
6. Summary of standardization literature 31 
7. Preparations of digitalis assayed 32 
8. Methods employed with — 
(а) Results. 34 
(б) Discussion of factors involved 40 
(c) Summary of results obtained 49 
9. Discussion of results. . . 51 
10. Report on the preparations examined.. 54 
( 5 ) 
