(_h_) _Silk_ is made at the large mill on the River Ver, St. Albans, and
at Redbourn.

(_i_) _Photographic plates_, _paper_, etc., are made at Watford, Boreham
Wood and Barnet.

(_j_) _Lavender Water_ is made at Hitchin, from lavender grown in fields
close by.

_Gravel_ abounds in many districts, and pits are extensively worked at
Rickmansworth, Hertford and at Heath, Wheathampstead, Watford and
Harpenden.

There are _windmills_ at Cromer, Albury, Goff's Oak, Anstey, Arkley,
Much Hadham, Weston, Tring and Bushey Heath. _Water mills_ are too
numerous to specify, there being several on many of the small rivers
named in Section II.


VIII. HISTORY

Hertfordshire was formerly a part of Mercia and of Essex. Its share in
what is usually called "History" can hardly be called great; but many
interesting details of its story are recorded in the histories of
Chauncy, Salmon, Clutterbuck, and Cussans. Among smaller works the
following will be found useful: Cobb's _Berkhampstead_; Gibbs'
_Historical Records of St. Albans_; Nicholson's _Abbey of St. Albans_;
Bishop's _Hitchin and Neighbourhood_, and _Bygone Hertfordshire_ by
various writers.