TWENTIETH ANNUAL REPORT 87 
14-inch flat iron, 100 feet 3-inch by *<-inch flat iron, all being fas- 
tened together with ®°<-inch machine bolts. Several trials by 
the elephants have conclusively proven that the fence is now 
sufficiently strong to withstand any attacks. The cost of this im- 
provement was $1,100. 
Wild Fowl Pond.—The recurring epidemics among the birds 
of the Wild Fowl] Pond have indicated for some time the neces- 
sity of supplying a sanitary bottom, but the appropriation of 
$3,000 for this purpose hung fire so long a time that it was not 
possible to do more than the excavating of about 200 cubic yards 
of soft mud, and the partial underpaving of about 60 per cent 
of the area that is to be concreted. About 1,000 cubic yards of 
fill and stone were used. As soon as the weather will permit 
the work will be completed, and the muddy portion of the pond 
will have a smooth, clean bottom of concrete. 
New Animal Hospital.—The drain from the hospital was 
connected with the main sewer by means of about 150 feet of 
6-inch vitrified pipe. 
IMPROVEMENT AND REPAIR FUND, 1915. 
Walk Repairs.—The walk repairs was again the largest 
item performed from this fund, there being resurfaced over 
95,000 square feet of walks and roads, the main walks being: 
Pheasant Aviary Walk, Mountain Sheep Walk, Beaver Valley 
Walk, Service Road for its entire length with the exception of 
a stretch of about 300 feet, Crotona Entrance Plaza and walk, 
and the Boston Road Entrance Plaza. At the Concourse about 
2,000 square feet of concrete sidewalk was laid, and a great deal 
of the brick taken up and relaid upon a concrete foundation. 
The total expenditure for walk repairs was $4,025. 
Heating Repairs.—The heating repairs consisted of the in- 
stallation of a new hot-water supply boiler and additional radia- 
tion at the Administration Building, the installation of a steam 
heating plant at the dwelling at Nursery, and the resetting of 
two boilers at the Large Bird House, and one at the Rocking 
Stone Restaurant. In addition to that a great many minor 
repairs to pipes, valves, etc., were done, and a number of new 
flues supplied. The expenditure for this work was $1,100. 
Flying Cage.—Repairs to and recovering of the Flying Cage 
which had been begun last fall, were carried on during the win- 
ter and early spring whenever weather conditions permitted. 
