243 
Festuca elatior, ..,and also the variety pratensis, Gray. Grassy 
places, 1889-91-92. 
PROVIDENCE, R. I. 
A Preliminary List of the Plants found in the Ridgewood Water Supply 
of the City of Brooklyn, King’s County, N. Y, 
By SmitH ELy JELLIFFE. 
Since the Ist of November, 1892, weekly examinations have 
been made of the plant life in the drinking water of Brooklyn. 
The water was taken from the tap of the third-story of a house 
near Prospect Park. One day in each week it was allowed to run 
for 24 hours through a filter. The residue was then collected and 
examined during the week and then kept in glass vials for future 
comparative study. The following list is a preliminary one, the 
research being intended to cover the space of one year. 
SCHIZOMYCETES. 
The examination for bacteria was only partial and purely ex- 
perimental, Esmarchsproll’s were made once each month, but the 
isolation of the various colonies was not completely carried out. 
Bacillus fluorescens, liquefaciens. This bacterium has been preva- 
lent in every month’s supply thus far examined. 
Bacillus fluorescens, non liquefaciens. Wess frequent than the first, 
still constant. 
Bacillus vielaceus, Once only observed. 
Bacillus subtilis, Cohn. Present throughout the time of the exam- 
inations. 
CYANOPHYCE. 
Oscillaria limosa, Ag. Found throughout February. 
Oscillaria tretichi, Kitz. Infrequent. 
O. aeruigeneo-cerulea, Kiitz. December 17, 1892. 
CHLOROPHYCE. 
Scenedesmus caudatus, Corda. Frequent throughout the six | 
months. 
S. dimorphus, Kiitz. January 18th. 
Pediastrum Boryanum (Turp.) Mengh. November, March. 
