PEPPER TREE AS A CAUSE OF HAY FEVER. 



183 



frequently been found in Bloemfontein. Dust was present on all 

 the plates and was usually very plentiful. Of the six plates on 

 which pepper tree pollen was not found, three were reported 

 as having been suspended " away from pepper trees." Only one 

 other kind of pollen was found, and this was present on four 

 plates. Its identity could not be determined, but it occurred in 

 smaller amounts than that of the pepper tree. Again, as at 

 Bloemfontein, dust and pepper tree pollen are the outstanding 

 features. 



Table XV 

 Meteorological Observations : Kimberley, 1920. 



Grahamstown. 



Plates were exposed in representative parts of Grahamstown 

 from December 3-7, 1920, and from December 11-13, seven 

 plates during each period. Most of them had no pollen and there 

 was a noticeable absence of dust as compared with slides exposed 



