452 BROOKS. 



It is impossible, from the above data, to deduce the constitution of 

 these substances from narra wood. However, it has been shown that 

 narrin is closely related to santalin and there undoubtedly exists a 

 close relationship between homopteroearpin and narrin. Were this dye 

 likely to become of commercial importance the investigation of it would 

 be continued. 



The botanical determinations and much of the descriptive matter 

 concerning the use of the dyes was furnished by Messrs. Merrill, Fox- 

 worthy, and Eobinson, of the botanical laboratory of the Bureau of 

 Science. 



