NINETEENTH ANNUAL REPORT 93 



treated with paraffin. Lead lined sheet iron gutters were put in 

 front of all the cages. All the iron work, including that in con- 

 nection with the sliding doors of the sleeping dens, was given 

 a through overhauling and replaced where necessary, and a 

 great deal of tiling was repaired or replaced. 



The upper portion of the eastern outside wall of this build- 

 ing, which had been disintegrating very badly for a number 

 of years, was relaid or replaced as was found necessary. Many 

 of the terra-cotta blocks were entirely removed, and replaced 

 in beds of mortar. This work was done by our own force, at 

 about one-quarter the cost of the lowest estimates received from 

 contractors. 



In the heating system of this building, some changes were 

 made, and new coils were installed under the floors of two of 

 the large cages. 



Bear Dens. — The concrete floors and the tanks of the old 

 series of Bear Dens were badly cracked and in a leaky condition. 

 In the most northerly den, the entire floor was torn out, and a 

 new one, provided with expansion joints, was put down. The 

 tanks in three of the dens were partly torn out, supplied with 

 new water-proofing where needed, and relined with a five-inch 

 layer of reinforced concrete, and a heavy rim was so constucted 

 that the overflow water will go directly into the sewer. 



Heating Repairs. — In the Antelope House, the wall coils in 

 the four northeast stalls were put out of commission last winter 

 by a break of the flow and return pipes to these coils. Owing 

 to the fact that these pipes were imbedded under the concrete 

 floors of one of the stalls, it was necessary to remove the con- 

 crete flooring before repairs could be made. The new pipes were 

 placed on the partition walls, so that in the future they will be 

 more accessible. 



Breaks of this nature must be expected during the next few 

 years in several of the older buildings, as in many cases, cheap 

 steel pipe was used. Unfortunately it is impossible to tell where 

 these breaks will occur. 



Flying Cage. — Owing to the presence of the birds in this 

 cage until late this fall, it was not possible to do much work 

 toward the repairing and recovering of this structure except the 

 manufacturing of the new netting, which was done in our own 

 shop. As soon as the cage became available, a scaffolding was 

 erected in such a manner that any section thereof can be taken 



