1906] CURRENT LITERATURE 223 
Leaflets on Philippine botany.—Under this title A. D. E. ELMER proposes 
to issue in serial form articles on Philippine plants, both scientific and economic, 
printed in English, Latin, German, or French. This publication will appear at 
irregular intervals, at a subscription price of 1? cents per page, and may be obtained 
by addressing the editor at Manila. The first issue is a paper of 41 pages entitled 
Philippine Rubiaceae, by the editor, containing 150 species, of which 45 are new, 
representing 42 genera.—J. M. C. 
Das Pflanzenreich.*— Part 26 contains the Droseraceae by L. Diets. Dro- 
sophyllum, Dionaea, and Aldrovanda are regarded as monotypic genera; while 
Drosera is credited with 84 species, 5 of which are new. A very full discussion 
of structure and range precedes the synopsis—J. M. C 
Pflanzenfamilien.s—Part 224 includes the completion of the Spiridentaceae, 
the Lepyrodontaceae, and the Pleurophascaceae, and a portion of the Necke- 
raceae, all by V. F. Brorwervus. Part 225 continues the Ascolichenes by A. 
ZAHLBRUCKNER.—J. M. C. : 
NOTES. FOR STUDENTS. 
contents of a Vaucheria filament, but later found that it was possible to observe 
the contents in situ. He saw the ultramicroscopic particles of plasma and 
chlorophyll, the former white and blue, the latter red and green—colors whose 
significance is unknown as yet for lack of sufficient physical investigation of 
the instrument. He watched the collision of plasma particles with structureless 
oil drops and their recoil, and the like collisions of chlorophyll particles and 
their disappearance in the oil, in which the number of red and green chlorophyll 
Sranules steadily increased. This appears to be actually the formation of a 
colloidal solution of chlorophyll in oil—an oleosol. 
or stellate flecks of chlorophyll particles are distributed through the stroma, 
OBE. Structure is like that of the protoplasm; there is no indication of the 
Uticn of chlorophyll in oil droplets lying in the stroma—a widely accepted 
ion, 
SEnciER, A., Das Pflanzenreich. 26 Heft. Droseraceae von L. Drets. pp- 
730. figs. 40 (286), map 1. Leipzig: Wilhelm Engelmann. 1906. M 6.80. 
4 ENGLER, A. und Prantt, K., Die natiirlichen Pflanzenfamilien. Lieferungen 
224 and 225. Leipzig: Wilhelm Engelmann. 1906. 
. §GarpuxKov, N., Untersuchungen mit Hilfe des Ultramikroskopes nach Seiden- 
topf. Ber. Deutsch. Bot. Gesells. 24:107-112, 155-157. 1906. 
