144 Origin of the British Flora. 
Interglacial:— 
Admiralty Offices, London; Airdrie, Lanark. 
Early Glacial :— 
Beeston, Norfolk; Ostend, Norfolk. 
ALNUS GLUTINOSA, Linn. 
Neolithic:— 
Submerged peats of the Thames Valley at Tilbury 
Docks, Albert Docks, and Crossness; Kings Lynn; Horn- 
sea, E. Yorkshire; Sand le Meer, E. Yorkshire; Redhall, 
near Edinburgh; Hailes, near Edinburgh; Fillyside, near 
Edinburgh (raised beach). 
Late Glacial :— 
Hoxne, Suffolk (bed C); Hailes, near Edinburgh (lower 
bed). 
Interglacial: — 
Grays, Essex ; Shacklewell, London; Hitchin, Hert- 
fordshire; Hoxne, Suffolk (beds D and E); Southelmham, 
Suffolk. 
Early Glacial :— 
Beeston, Norfolk (base of Arctic Freshwater Bed). 
Preglacial (Cromer Forest-bed) :— 
At most localities in Norfolk and Suffolk. 
CARPINUS BETULUS, L. 
Interglacial :— 
Hoxne, Suffolk (bed D). 
Preglacial (Cromer Forest-bed) :— 
Pakefield, Suffolk. 
