PEPPER TREE AS A CAUSE OF HAY FEVER. 157 



Table IV {continued). 



Exposure of Pollex Plates at Bloemfoxtein, October axd 

 November, 1919. 



Comments (on weather during exposure of slide; on pollens found, etc.) 



Windy and dusty. 



Very windy and dust.v. Eisht of the grains were Pine pollen, the remaining three were 



large oval grains with pointed ends, kind unknown. 

 Windy. 



Very windy and dusty. 

 Somewhat windy. 

 Hot, very windy and dusty; 205 grains of pepper tree pollen, mostly in groups, were counted 



on area of 16 m.m. x S m.ni. The five other Pollens were all pines. The plate was 



only some 3.5 feet away from the nearest edge of the crown of a male pepper tree; and 



was about the same height as the top of the crown. 

 Hot, windy and dusty. 

 Hot, very windy and dusty. 

 Hot, very windy and dusty. 

 Fairly calm. 

 Fairly calm. 



Fairly calm, the other Pollens were grass, grains circular. 

 Fairly calm 



Somewhat windy and dusty; the other Pollens were Artemi.sia. 

 Somewhat windy and dusty. 

 Very windy and dusty. 

 Very windy and dusty. 

 Very windy and dusty. 

 Calm. Rain fell on the 7th. 

 Cold South wind. 



Cold South wind. Two of the other Pollens were Chilianthus. 

 Cold South wind. Small circular grains of grass pollen. 

 Calm. 



Calm. Single grains of two kinds. 

 Calm. 



A violent dust storm on the 12th; air very dry. 

 A violent dust storm on the 12th; air very dry. The other Pollens were Chilianthus and 



an unknown kivd of pentagonal outline. 

 A violent dust storm on the 12th; air very dry. The grains of pepper tree pollen were 



in groups of 2 and ,''.. 

 Air dry; hot, windy and dusty. 



Air dry; hot windy and dusty. 



Air dry; hot, windy and du?ty. 



Stropgly westerly wind during day; dry and hot. 



Strongly westerly wind during day; dry and hot. 



Very windy during part of time. 



Very windy during part of time, 



Very windy during part of time. 



Jlostly calm. 



Mostly calm. The other Pollens were small circular grains of grass (">) pollen 



Mostly calm. 



Hot, windy and dusty. 



Hot, windy and dusty. 

 Hot, windy and dusty. 

 This plate was huna in a Eucalyptus tree some 1.50 paces from the nearest male pepper 



tree. The other pollen was all Eucalyptus and this was the only occasion on which this 



kind of pollen was found on the plates. 



Hot and dry; of the 3 pollens, 2 were the grass recorded on the 18th, and one Artemisia. 



The following particulars should be noted regarding the 

 sites at which the pollen plates were exposed : 



Grey University College : This is to the west of and beyond 

 the town. There were no pepper trees near the plates and none 

 at all to the west. (It will be remembered that during the 

 season when epidemic hay fever occurs the prevailing wind is 



from the west.) 



