(39 ) 
sideration in view we have devoted a portion of the low land 
near the northwestern end of the tract to a bog garden, and 
have supplied abundant space for the successful cultivation of 
all such plants as will exist in the open in our latitude. It is 
recommended that no strictly systematic arrangement be at- 
tempted here beyond the grouping of species of the same 
genus. Approximately 5 acres are planned for this feature. 
16. Lakes and Ponds. 
It is recommended that the bog, now occupying the de- 
pression between the elevated land for the Museum site and 
the fruticetum, be excavated to a depth of about six feet and 
made into two lakes, separated by the longitudinal driveway 
system west of the Bronx; the surface of the westerly lake to 
be established at a slightly higher level than that of the east- 
ern one, and the surface of the eastern one to be about two 
feet above the level of the Bronx, when the river shall be 
lowered to effect the necessary drainage of the northern part 
of the tract. These lakes may be fed by two streams now 
running through the Mosholu Parkway ; one of these streams, 
which takes its rise in the lost water from the Williamsbridge 
reservoir, runs at present into the bog and supplies a constant 
stream of sufficient volume to keep both lakes full. With this 
brook properly protected and enclosed in a pipe, an efficient 
water supply would be obtained. The other stream in the 
Mosholu Parkway rises in the Parkway, a mile or so from the 
Garden site, and flows through the Parkway for its entire 
length; it is at present diverted into the Webster Avenue 
sewer. It supplies a larger volume of water than the one 
above described, and we have found, by leveling, that it runs 
under Webster Avenue at an altitude about two feet higher 
than that of the culvert under the New York & Harlem Rail- 
way, which carries the first stream described into the Garden. 
As this second stream rises within the Parkway, and the Park- 
way furnishes most of its watershed, it is not liable to contami- 
nation at the present time, and will be less liable as the city’s 
