REPORT OF THE SECRETARY 77 



feet, with open moat effect and enclosed by a paneled guard rail. 



A 3-incli water main was laid from the cockatoo cage to the rear 

 of the bird house, a total of 625 linear feet. 



New concrete walks were completed back of the bird house and 

 around the large mammal house covering a total area of 1,200 square 

 yards. A total of 7,880 square yards of bituminous concrete was laid. 

 This included roads, walks, and a splendid parking area for buses 

 on the main road below the large mammal house. About 3,400 linear 

 feet of reinforced concrete curbing was constructed. An important 

 improvement from the standpoint of safety was the construction of 

 an underground duct for the high tension, three-phase electric supply 

 line from the point at which it enters the Park, to the bird house. 

 Tliis covered a total distance of about 715 linear feet. 



A total of 4,900 square yards of road were repaired and resur- 

 faced with bipac. In connection with the excavating and fills, and 

 new road and walk work, about 1,600 feet of surface and gutter 

 drains were laid. The old smokestack, in use prior to the develop- 

 ment of the new shops in 1936, was demolished. 



A definite aid to the always-present parking problem was the im- 

 provement of several parking areas. 



With the completion of the principal buildings and grading ad- 

 jacent to the structures and landscape grading elsewhere about the 

 Park, there were considerable barren areas that required planting. 

 Accordingly, during the fiscal year extensive plantings were made 

 of holly, flowering crab, flowering peach, dogwood, native forest 

 trees, such as beech, walnut, ash, elm, hickory, Virginia cedar, Vir- 

 ginia pine, red pine, red spruce, hemlocks, and ornamental shrubs 

 such as hibiscus, abelia, forsythia, spirea, japonica, azaleas, and privet. 

 In all, more than 400 trees and 600 shrubs were planted and about 

 5 acres were seeded to grass. 



The Zoo is indebted to Dr. Francis B. Lincoln, of the Maryland 

 Agricultural Experiment Station, for hollys, flowering crabs, flow- 

 ering peaches, evergreens, roses, jasmine, sand cherries, ilex, and 

 other shrubs; to the United States Forest Service for pines and 

 spruces; to the United States Soldiers' Home for evergreens, japonica, 

 amelancliier, crepe myrtle, magnolias, and figs; to Clifford Lanham, 

 of the District Nursery, for Chinese elm and maples; to Dr. Ira N. 

 Gabrielson, Chief of the United States Biological Survey, for sweet 

 gum and pines. Mrs. Mary G. Corby very kindly permitted us to 

 obtain cedars, wisterias, barberries, and pines from her estate. 



These improvements were carried on with the minimum of cost. 

 All stone used was quarried in the Park. Sand and gravel were 

 also obtained from the creek bed in the Park. 



