70 SCIENCE PROGRESS 



Details of the work of natural indigo may be found in the 

 Reports of the Sirsiah Indigo Research Station and in the 

 Botanical and Indigo Series of the Agricultural Research 

 Institute, Pusa. To these the author acknowledges his in- 

 debtedness ; he is also indebted to the workers in the various 

 branches who placed their experience at his disposal in his 

 efforts to give a brief general outline of a large field of work. 

 For its incompleteness and for any inadequate statement of 

 their researches the writer can only ask their indulgence. 



