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1. 



2. 



C O N T E N^ S . 



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4 



Page. 



Reports for the Year 1907: — 



a. Reports of the Officers of the Board 7 



b> Nineteenth Annual Report of the Director 11 



Scientific Papers: — 



a. The Florida strangling figs. — 



By Ernst A. Bessey 25 



^ 



b. Crataegus in Missouri. — 



By Charles Sprague Sargent 35 



c. An ecological cross section of the Mississippi river in the 



re^on of St. Louis, Missouri, — 



By Henri Hus 127 



d. Illustrated studies in the genus Opuntia. — I. 



By David Griffiths 259 



€, Agave rigida — Furcraea rigida — Agave angustifolia. — 



By William Trelease 273 



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(5) 



i 



