207 



A large portion of the walks finished this season have been sur- 

 faced to a depth of three inches with tar concrete ; the sub-structure 

 being the same as for gravel walks. 



Two kinds of concrete have been used, one known as the Burlew 

 patent, in which boiled pine tar is used, and the other the Scrimshaw 

 patent, in which raw coal tar is used. The concrete is prepared by 

 mixing these tars with gravel or fine broken stone, coal ashes, &c. 



In laying this material any required form is readily given to the 

 walks and gutters. 



Drain tiles of two inches internal diameter were laid under all 

 walks requiring it, at a depth of three feet six inches, and were con- 

 nected with the walk silt-basins. 



Also, along the center line of the walks and generally in the same 

 trench with the tile, were laid glazed vitrified pipe which form a part 

 of the general drainage system of the park. 



At proper intervals under the walk gutters, silt-basins were 

 located to receive the surface drainage and conduct it through branch 

 pipes into the general drainage system. 



POOLS. 



Two pools have been completed each with a depth of three feet 

 of water. 



The play-ground pool is situated in a natural depression, and is 

 approached by winding walks with rustic steps. 



The Battle Pass pool lies at the foot of a steep declivity and is 

 shaded by natural forest trees. 



The soil has been removed from the greater part of the site of 

 the proposed lake and reserved for future use, and several thousand 

 yards of excavation have been made. 



The northern part of the lake has been nearly completed and 

 about five acres prepared temporarily for a skating pond. 



The supply of water for the pools and lake is at present obtained 

 from the park drainage, and the Nassau Water Department. 



AGRICULTURAL DRAINAGE. 



For all clayey or retentive soils a thorough system of tile drain- 

 age has been adopted, and as far as the grounds have been finished, 

 has been carried out. 



The sizes of tile have been carefully adapted to the work required 

 of them. 



The quantity of water that will reach these drains, has been com- 



