INTEODUCTION. XI 



Heaths and Pinner Hill. Stanmore Heath and Highwood^ the highest 

 parts of this range of hills, are also the points of greatest altitude in 

 the county. 



There is another shorter and somewhat lower range of hills about 

 4 miles from the Thames, to the north- east of London. These are 

 the Highgate and Hampstead Hills. Their highest point is that part 

 of Hampstead Heath near where Jack Straw's Castle stands. Besides 

 these there is no other considerable eminen3e in Middlesex, except the 

 isolated hill on which the old church of Harrow stands. 



The following heights above the mean sea level have been supplied 



from the Records of the Ordnance Survey, through the kindness of 



its director, Colonel Sir Henry James : — 



Feet 

 County boundary stone at Hart's Bourn (on Bushey and Watford 



Road) 504-104 



Stanmore Heath, guide-post at north corner of Bentley Priory . 492-920 



Rising Sun public-house, Highwood Hill 443-491 



Hampstead Heath, mark on fourth milestone from St. Giles's pound 441-337 



Hampstead Heath, mark on brick wall 7 chains east of Castle Hotel 440-583 

 Hampstead Heath, at junction of road to Child's Hill, near Castle 



Hotel 436-491 



West entrance to Pinner Hill House, Watford Road . . . 436-425 



Original toll-house, Highgate 424-065 



Mr. Foyne's (grocer) house, east side of road, Highgate . . 417-014 



St. Michael's church-tower, Highgate (base) .... 415-880 



Harrow-on-the-Hill church-tower (base) 405-518 



Grate at entrance to Mill Hill Church 402-048 



Entrance to Mr. Johnson's house, Mill Hill .... 401*528 



South entrance to Pinner Hill House 381-810 



Guide-post at junction of roads to Mount Pleasant, High wood Hill 297-581 



New church, Harrow-on-the-Hill 292-611 



Mark on post of wooden seat on top of Primrose Hill . . . 219-154 



South-east angle of wall of reservoir on Barrow Hill . . . 161-083 



Junction of Barnsbury Park and Thornhill Road, Islington . 140-959 



West entrance of Trinity Church, Cloudesley Square, Islington . 136-202 



The ground in Middlesex covered by London has generally a down- 

 ward slope from north-west to south-east, but it is much undulated, 

 though the levels have been a good deal altered in making streets and 

 buildings. 



6. Geology. — Only a very brief summary of the geological features 

 of the county can be given here. For fuller information Mr. 

 Whitaker's Memoir, describing sheet 7 of the Geological Survey, 

 and the papers quoted by him, should be referred to. The following 

 account has been mainly drawn up fi-oni these sources : — 



