54- Origin of the British Flora. 



evidence of former climate. It will be seen that the date 

 of certain of the deposits is unmistakable; and particular 

 attention having been devoted to these and to their in- 

 cluded plants, any doubt as to the age of the remainder 

 is of comparatively little consequence botanically — nearly 

 all their plants can be authenticated from specimens found 

 in deposits of known age. The localities are placed in 

 alphabetical order, partly as being most convenient, partly 

 to avoid any appearance of forcing the correlation, as 

 might be suggested if they were here grouped into periods. 

 The principal foreign localities are added for purposes of 

 comparison ; but I have seen few of the plants from these. 

 It will be noticed that in the German Interglacial deposits 

 Brasenia purpurea, a water-lily not now living in Europe, 

 is a common fossil, though it has not yet been discovered 

 in Britain. 



Admiralty Offices, London. 



(Abbott, ' The Section exposed in the foundations of 

 the New Admiralty Offices,' Proc. Geol. Assoc, Vol. XII., 

 pp. 346-356. 1892.) 



Associated with or below remains of Mammoth, Hippo- 

 potamus, and Rhinoceros are found a few plants, the only 

 determinable species being: — 



Betula nana. Ceratophyllum demersum. 



Airdrie, Lanark. 



(Dunlop, ' Note on a Section of Boulder-clay, containing 

 a Bed of Peat,' Trans. Geol. Soc. Glasgow, Vol. VIII. , 

 pp. 312-314. 1888.) 



The peat is classed as Interglacial on account of its 

 occurrence between two beds of Boulder-clay. It contains 

 beetle-remains and the following species of plants : — 



