24 



garden at Rio and the forests around Para. The first of these 

 will appear in our next number. 



The U. S. Department of Agriculture has recently published 

 a circular, No. 46-C, Methods of Collecting and Preserving 

 Pollen for use in the Treatment of Hay Fever. 



The Department of Agriculture calls attention to the "in- 

 creasing demand for wind-borne pollen" for making extracts 

 with which to treat hay-fever patients. 



Various methods of collecting pollen have been tried but 

 they have not always proved entirely satisfactory for providing 

 pollen in quantity and of acceptable purity. Improvements in 

 such methods have been developed by the department which 

 seem to adapt them to all requirements. 



