(20) 
from April to the last of October, as outlined below. The 
average attendance during July and August was twenty 
per cent. less than in May and June, and about forty-seven 
per cent. less than in September and October. 
April 29. ‘The Preservation of Our Native Plants,’ 
by Dr. N. L. Britton. 
May 6. ‘What is Botany?” by Dr. C. Stuart Gager. 
May 13. “Transforming an Old Swamp,” by Mr. 
George V. Nash. 
May 20. “The Reef-building and Land-forming Sea- 
weeds,” by Dr. Marshall A. Howe. 
May 27. ‘The Influence of Soil Acidity on Plant Dis- 
tribution,” by Mr, Frederick V. Coville. 
Dr. W. A. Murrill. 
June 17. ‘Collecting in the High Mountains of Colo- 
rado,”’ by Mr. Fred J. Seaver. 
June 24. “Past Climatic Conditions Indicated by Fossil 
Plants,” by Dr, Arthur Hollick. 
July 1. “Wild Flowers of Summer,’ by Dr. N. L. 
Britton. 
July 8. “Swedish Botanical Gardens,” by Dr. W. A. 
Murrill. 
July 22. “The Uses of the Cacti,” by Dr. H. H. Rusby. 
July 29. “Plants as Insect-traps,” by Dr. John H. 
Barnhart. 
Aug. 5. “Botanical Exploration in Haiti,” by Mr. 
George V. Nash. 
Aug. 12. “The Paris Botanical Garden,” by Dr. W. A. 
Aug. 19. “A Visit to the Panama Canal Zone,” by 
Dr. Marshall A. Howe. 
Aug. 26. “Evergreens: Their Uses in the Landscape,” 
by Mr. George V. Nash. 
