

In the general description of the order Anacardlaci\e» 

 Gray says: "Juice or exhalations often poisonous." Whe- 

 ther it is contact with some part of the plant, or with 

 the exhalation from the plant, that causes the well known 

 skin eruption has been a topic for discussion ever since 

 its source was known. On account of its intangible na- 

 ture there has been more speculation than experimental 

 evidence bearing on this question, although a few investi- 

 gations have been made with the object of isolating the 



polfson* It is most generally believed that the exhala- 



2 

 tions are poisonous. Dr. J. H. Hunt states that the 



1, Gray, Manual of Botany, 6th Edition, p. 119, 



2. Brook. Med. Jour. June 1897. 



