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107. STUDIES IN THE CYPERACE. By Prof. Nathaniel L. Brit- 
ton. 
1. The genus Cyperus. Cyperus is one of the largest genera 
of the Sedge Family, comprising several hundred species, 
widely distributed, one of the largest being the Papyrus of 
the Nile valley, Cyperus Papyrus. The present investigation 
is a systematic study of the East American species. 
Exhibits: A selection of the plants mounted as herbarium 
specimens with drawings. 
2. The genus Dichromena. This is one of the smaller genera, 
the species mostly American. 
Exhibits: The two East American species with drawings. 
108. STUDIES IN. THE CHARACE. By Timothy F. Allen, M.D. 
The Characee or Brittle-worts form a peculiar order of the 
Green Alge (Chlorophycez), and inhabit fresh and brackish 
water. Owing to their aquatic habitat they are not much col- 
lected nor observed, and are popularly little known. 
Exhibits: Plates of a number of American species new to 
science. 
109. STUDIES IN THE GENUS BUTNERIA. By T. H. Kearney, Jr., 
Butnertia, also known as Calycanthus, is a genus of North 
American shrubs of somewhat doubtful relationship, being by 
some authors regarded as close to the Rose Family, and by 
others more nearly allied to the Magnolias. The present 
study is an attempt to throw light on this problem and to 
effect a satisfactory classification of the species. 
Exhibits: The species of Autuerza, mounted as herbarium 
specimens with drawings. 
110. STUDIES IN THE GENUS POLYGONUM. By John K. Small. 
Polygonum is a large genus of herbaceous plants, commonly 
known as ‘‘knot-weeds.” The present study is an investiga- 
tion of the comparative anatomy and morphology of the 
American species, numbering about 85. 
Exhibits (a.): Typical species of the several sections of the 
genus mounted as herbarium specimens with drawings of each. 
(4.) Microscopic cross-sections of the stems of Polygonum art- 
Jolium and Polygonum Virginianum with drawings. 
