722 



A TEXT-BOOK OF BOTANY. 



landrene and dipentene, and containing about 9 per cent, of 

 borneol, 3 per cent, of bornyl acetate and some cadinene. The 

 True or ANISE-SCENTED GOLDEN-ROD (Solidago odora) yields 

 an aromatic volatile oil and a small amount of tannin. 



FIG. 398. Method of gathering the pollen of Golden-rod (Solidago Shortii} for immuniz- 

 ing the hay-fever horses. The plant is gathered just about the time that the pollen-sacs 

 are ready to open, then taken to a sunny room free from draft and air disturbances 

 placed slanting in a basin filled with water, the blossoms drooping over the sides of the 

 vessel, with clean, smooth paper spread underneath them. The following morning the 

 pollen will be on the paper and can readily be gathered with a feather-top or a quill. 

 After Schimmel & Co. 



The rhizome of the large Button-snakeroot (Lacinaria scari- 

 osa), growing in the eastern and central portion of the United 

 States and Canada, contains o.i per cent, of volatile oil, about 

 5 per cent, of resin, and 2 per cent, of a caoutchouc-like substance. 



