72 Origin of the British Flora. 



The cuttings for the North Sea Canal showed silted-up 

 channels with Pleistocene plants. One at Beldorf exposed 

 a trough cut in the boulder-clay, filled with deposits yielding 

 temperate plants, at the top of which occurred a layer with 

 Betula nana, the whole being levelled up and hidden by 

 recent peat. This intercalation of a temperate flora be- 

 tween the boulder-clay and an Arctic plant-bed agrees 

 with the succession found at Hoxne in Suffolk. Another 

 channel at Grossen-Bornholt is apparently of the same 

 date. The plants occur in several different beds, full 

 details being given in Dr. Weber's papers. 



Ranunculus. Alnus glutinosa. 



Nuphar luteum. Carpinus Betulus. 



Nymphsea alba. Corylus Aveilana. 



Brasenia purpurea. Ouercus Robur. 



Tilia platyphyllos. Salix pentandra (?). 



Ilex aquifolium. Caprea. 



Acer. Ceratophyllum demersum. 



Prunus Avium. Juniperus communis. 



Hippurus vulgaris. Picea excelsa. 

 Myriophyllum spicatum. Pinus sylvestris. 



Trapa natans. Stratiotes aloides. 



Galium uliginosum. Typha. 



Vaccinium Vitis-Idaea. Potamogeton natans. 



Myrtillus. Najas flexilis. 



Andromeda Polifolia. Eriophorum. 

 Fraxinus excelsior {}). Carex panicea. 

 Menyanthes trifoliata. Holcus. 

 Betula alba. Phragmites. 

 nana. 



Hailes, near Edinburgh. 



(J. Geikie, 'Great Ice Age,' 3rd edit., p. 99. 1894; 

 Bennie, ' Arctic Plants in the old Lake Deposits of Scot- 

 land,' Ann. Scottish Nat. Hist., 1894, pp. 46-52.) 



Two plant-bearing deposits are found at this spot. 

 The lower one rests immediately on the Boulder Clay and 



