Some Additional Notes on Essex Watersheds. 133
Potter Street and Eye-hill Common, thence southward to
Epping Union, and then almost along the line of the New
Road, but crossing Ambresbury Banks and round to the
west of the head of the Wake Valley Pond and of Warner's
Pond, Woodford, down Gilbert's Slade to Forest Lodge, west
of Leytonstone Station, to Forest Gate Station, North End,
to East Ham Station and over East Ham Levels to North
Woolwich.
Contrary to what is stated in my former paper (Trans.
ii. p. 81), the Ingrebourne originates in several streamlets
between South Weald and Navestock, which uniting flow to
the west of Upminster and Rainham into Erith Reach. A
smaller stream flows from Stubbers, between North and
South Ockendon, into the Thames below Rainham.
The Mardyke may be said to rise in Thorndon Park,
receiving streams from Dunton Waylett and the northern
slope of the Langdon Hills, and being joined at Bulphan by
considerable streams from Brentwood and Childerditch, and
from Cranham and Great and Little Warley. It then flows
past Stifford and Aveley to Purfleet. Other small streams
drain the southern slope of the Langdon Hills, partly into the
creeks west and north of Canvey Island.
The watershed dividing the Roding and these streams from
the Chelmer system, starting from between Elsenham and
Tilty, passes to Woodgate and Little Easton, east of Easton
Park, between. Elms and Hurts to High Roding, east of
Aythorp Roding, Leaden Roding, Margaret Roding, Berners
Roding, Shellow, Willingale Spain, and Norton Mandeville,
west of Fingrith Hall, Blackmore, and Doddinghurst, hut
east of Stondon Massey and Navestock, to Bryces, and not as in
map (pl. vi.) to paper in vol. ii. of the 'Transactions,' and east
of South Weald and Brentwood Church to the east side of
Thorndon Park. This basin is then separated from the
valley of the Crouch by a continuation of the same line between
East Horndon and Dunton Waylett to Nightingales, south of
Vange Hall, north of Pitsea Station and of Bowers Gifford, to
Jervis and Hadleigh Castle, north of Leigh and of Snell's
Farm, south of Milton Hall and Southchurch, to Shoeburyness.