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Pig. I. Growth Uabit of /'<'/<7/o5/t';««w pKrpureiim f. arenuriitm in the bimchgrass prairie, 

 Waukeg'an, Illinois. August 13. l'»10. 



Pig-. 2- Blowout in the oak (^iiercus vehitina) association near Beach, Illinois. Revege- 

 tation consists largely of heath plants, but scattered throughout are oak seedlings. July 19, 

 1909. 



