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Temporary Greenhouse. 
The greenhouse on the Columbia University grounds at 
116th St. and Amsterdam Ave., the use of which was 
kindly granted by the President of the University last year, 
has been very useful, and between 600 and 700 species of 
plants are now deposited in it, obtained from various sources. 
It was found necessary to repair parts of the roof and walls 
of this structure, but the expense incident to these repairs has 
been more than justified by the results. 
Willamsbridge and Bronx Park Sewer. 
The Williamsbridge and Bronx Park sewer, the construction 
of which across the grounds was begun by the Commissioner 
of Street Improvements of the 23d and 24th wards in 1896, 
under permission from the Board of Managers, was completed 
early in the year. 
Temporary Railway for the Construction of the Jerome Park 
Reservoir. 
This railway, constructed by Mr. J. B. McDonald, con- 
tractor for the city, for the excavation and building of the 
new reservoir at Jerome Park, under permission from and 
agreement with the Board of Managers, has been operated 
by Mr. McDonald throughout the year. No accident has 
occurred, as the crossings have been carefully guarded. 
Care of the Grounds. 
In continuance of the work begun last year, a considerable 
number of dead and imperfect trees have been removed from 
time to time during the year, dead branches pruned from oth- 
ers, and fallen branches gathered up and destroyed. There 
are now very few trees of imperfect character in the grounds 
to the west of the Bronx River, except in the densely wooded 
forest reserve where nature has, for the most part, been al- 
lowed to take her own course. 
The scattering of paper and other refuse by visitors, which 
was a source of considerable annoyance last year, has been 
greatly reduced by means of a number of sign-boards placed 
