﻿CONTENTS. 



Page. 



1. Reports for the Year 1906: — 



a. Report of the Officers of the Board 7 



h. Eighteenth Annual Report of the Director 11 



2. Scientific Papers: — 



a. The literature of Furcraea with a synopsis of the known 



species. — 



By J. R. Drummond 25 



b. Branch cankers of rhododendron. — 



By Hermann von Schrenk 77 



c. On frost injuries to sycamore buds. — 



By Hermann von Schrenk 81 



d. The germination of Hydrastis canadensis. — 



By Henri Hus 85 



e. An abnormal Odontoglossum Cervantesii. — 



By Henri Hus 95 



/. Virescence of Oxalis stricta. — 



By Henri Hus 99 



g. Effect of light upon the germination of spores and the 



gametophyte of ferns. — 



By H. C. Life 109 



h. Plantae Lindheimerianae. Part iii. — 



By J. W. Blankinship 1-3 



i. Additions to the genus Yucca. — 



By WUliam Trelease 225 



j. Agave macroacantha and allied Eugaves. — 



By WUliam Trelease 231 



(5) 



