PEPPER TREE AS A CAUSE OF HAY FEVER. 



185 



Maritzhurg. 



Unsettled weather with heavy thunderstorms daily in the 

 afternoons was reported as having delayed the exposure of pollen 

 plates at Maritzburg; but, eventually, 12 plates w^ere exposed in 

 various parts of the town towards the end of December, 1920, 

 and early in the following month. The pepper tree was in flower 

 at the time, but reports from doctors showed that there was 

 little or no hay fever. No pepper tree pollen and very little dust 

 were found ; but one other kind of pollen, whoso identity could not 

 be determined, was plentiful on three of the plates. The weather 

 records for December are given in Table XVII. 



Table XVII 

 Meteorological Observations : Maritzburg, 1920. 



Johannesburg. 



Five slides were exposed for 48 hours each in various ])artR 

 of Johannesburg on December 11 and 12-18, 1020. On the 11th 



