498 



Journal of Agricultural Research 



Vol. m, No. 6 



effort was usually made to expose plates at stations where there were 

 many diseased trees to the windward. 



Fig. 



-Map showing the location of some of the important outlying exposur^plate stations. Station si 

 is at the comer of tne plot represented in figure i. 



During wet weather the routine was often varied considerably, espe- 

 cially just after the cessation of a rain. At such times plates were often 

 exposed in more rapid succession, even to the extent of exposing several 

 in different locations at about the same time. 



