INTRODUCTION. XXXIX 



The area of eacli district averages about forty square miles ; tlieir 

 boundaries are shown on the accompanying map, and may be accu- 

 rately traced on the Ordnance survey. 



I. Upper Colne. — N. The north boundary of the county from its 

 western extremity to Deacon's Hill near Elstree ; W. The west 

 boundary of the county from its northern extremity to Iver Court (in 

 Bucks) ; S. A road from the Colne passing through Skrill and Col- 

 ham Green into the Uxbridge Eoad ; E. very irregular, from the point 

 last mentioned along the Uxbridge Eoad in a north-west direction 

 for a short distance, then north along the road to Ickenham, thence 

 north-east passing along the high ground south of Ruislip and Pinner 

 to Pinner Park Farm, Hatch End, and Harrow Weald : from this point 

 it is continued up Brook's Hill, crosses the grounds of Bentley Priory, 

 south of the mansion, and following the high ground across Brockley 

 Hill, joins the north boundary at Deacon's Hill. There is also an 

 outlying part of this district, the most northern part of Middlesex, 

 which, as it were, locks into Herts ; the county boundary limits this 

 on all sides, except the east, where it is bounded by the high road from 

 Barnet through Hadley and Potter's Bar. 



This district is more diversified in soil and situation than any 

 other : chalk is found in it alone, and it contains the highest ground 

 in the county. 



n. Lower Colne. — N. the south boundary of district I. ; W. the 

 west boimdary of the county from Iver Court to its south extremity ; 

 S. the south boundary of the county from its western extremity to 

 Twickenham ; E. from the point last mentioned along the road west- 

 ward through Fulwell towards Hanworth, thence north following the 

 road which crosses the Windsor (South Western) Railway, and passes 

 through Hatton and Harlington to Hayes, and so into the Uxbridge 

 Road, which it follows north-west to join the north boundary. 



This district is remarkably flat and uniform, with a sandy or 

 gravel soil ; a great many situations favourable for the growth of the 

 aquatics are found in it. 



HI. Cran. — W. the east of district H., and east of district 1., as 

 far north as Harrow Weald ; S. that of the county from Twiclcenham 

 Ait to the west side of Sion House grounds ; E. from that point along 

 the road westward through Spring Grove and Lampton, and north- 

 ward through Heston, Norwood, Southall, Northolt, and Wood End 

 to Harrow, thence it passes near Headstone Farm to Harrow Weald, 

 where it joins the north extremity of the western boundary; the district 

 is thus pointed at its northern extremity. 



