(177) 
Drainage. 
After observation of the water-level in the Herbaceous 
Grounds area for a year, and a close survey of the surface, 
four systems of porous 4-inch drain-tile were laid in it during 
the early spring, outflowing into the central stream. This has 
produced an entirely satisfactory drainage of the land, except 
at one place near the southwestern end of the valley, where 
another small system of tile may be placed to advantage aiter 
the necessary excavations for the pool for aquatic monocoty- 
ledons have been effected. 
A long system of six-inch and eight-inch porous tile was 
laid in the area about the stable-site near the eastern side of 
the grounds and south of the Bleecker street entrance, before 
the stable was built, and another long line of eight-inch tile 
was placed through the low grounds just north of the Bleecker 
street entrance. These, in connection with the filling and 
grading about the stable, have rapidly and satisfactorily car- 
ried off the water from these parts of the grounds. Both 
these systems require ultimate connection with the Bronx 
River; their outflow at present being turned into natural 
drainage valleys. The leaders from the roof of the stable 
find a convenient outflow into these pipes. 
The natural drainage lines have been kept open, so that 
there is now but little possibility of water-stagnation, except 
at points in the north meadows, where extensive filling still 
needs to be done before the drain-pipes can well be laid, and 
at places along the river, where the contemplated modifica- 
tions of the dam near the Lorillard mansion must be effected 
before entirely satisfactory conditions can be had. 
The past season has been a good test of the sanitary condi- 
tion of the tract. Large numbers of workmen have been 
employed on the buildings and grounds, but no sickness 
among them certainly traceable to the region itself has de- 
veloped. During the summer there was some malarial trouble 
among the police force at the Lorillard mansion, to be cred- 
ited, without doubt, to the well-water which had to be used 
before the city water-supply was brought to that building. 
