66 NEW YORK ZOOLOGICAL SOCIETY. 
immediately started pumping a three-inch stream of water into 
the head of the Beaver Pond; and this has continued automatically 
ever since, save in midwinter. The result is a great improvement 
in the quality of the water in the Beaver Pond, and the creation of 
a desirable running brook traversing the lower end of Beaver 
Valley. 
Water Supply at Bear Dens.—For several years past, the sup- 
ply of water for cage-washing purposes at the Bear Dens has 
been very inadequate, due to a feeble source of supply on 182d 
Street. To remedy this difficulty permanently, a line of two- 
inch pipe 400 feet long was run from the four-inch water main 
in front of the Reptile House eastward to the Bear Dens, by which 
there has been secured at the latter point a pressure of forty-five 
pounds per square inch against thirteen pounds per inch pre- 
viously. This also gives an increased supply of water at the Res- 
taurant and Buffalo Corrals. 
Tar Surface on Walks.—Our method of tar-coating the sur- 
face of walks has been found so successful and satisfactory we 
have resolved to treat all our macadam walks by that process. In 
1905 it was not possible to apply tar to the surface of all the 
walks that were constructed during that year. The process is 
necessarily somewhat slow, and can not be hurried with accept- 
able results. This branch of work was taken up as early as the 
season would permit and continued throughout the year. To 
facilitate the work, a surface burner was purchased and used as 
occasion demanded. During the year 28,000 square feet of walks 
were surfaced with tar and half-inch stone, and rendered properly 
smooth, frost-proof, permanently dry, and free from an objection- 
able quantity of dust. 
With the important thoroughfare known as Osborn’s Walk, 
from which the whole surface of fine screenings had been worn 
off, leaving the walk unpleasantly rough, a new experiment was 
tried. The walk was swept free from dust, a coating of hot tar 
was applied upon the irregular surface, the half-inch stone was 
applied in a thin coat, and it was saturated with tar. The bond 
thus made proved quite effective, and the success of this experi- 
ment will lead to other work of a similar kind. The principal 
walks re-built, or re-surfaced, were Osborn’s Walk, Pheasants’ 
Aviary Walk, and the two walks leading from the west and 
north to the new Boston Road Entrance. 
Near the Service Building a new walk and road combined was 
built to connect Beaver Valley with the Service Road, at the Rep- 
tile House. This connecting link is much used by visitors. 
