100° 



Fig. 1. — Map of Burma, Assam, and Siam, showing the route followed by J. F. Rock In 

 his successful hunt for the true chaulmoogra tree, which yields the oil now considered 

 a specific for leprosy. A large part of the country explored was practically unknown 

 botanically. The first authentic photographs ever made of the true chaulmoogra tree 

 and its relatives, which Mr. Rock succeeded in obtaining, have served to clear up the 

 confusion existing as to the source of this exceedingly important product. 



IV 



