of the Recent Flora of Britain, 183 
belonging to two species, Hippuris vulgaris and Carex rostrata. 
The occurrence of Betula nana gives a somewhat northern 
character to this flora. 
There is one other deposit which provisionally, and with 
great hesitation, has been placed in the interglacial division. 
This is the well-known peaty bed of Cowden Glen, in Renfrew- 
shire, so well described in Mr. Craig’s paper 1 . At the present 
day this old lacustrine deposit certainly lies beneath a boulder- 
clay, but the question has arisen — to what extent is this 
overlying boulder-clay merely the remains of a landslip ? 
The bed is certainly ancient, for it contains remains of the 
Megaceros and Bos primigenius ; but Mr. John Young points 
to the landslips that still occur as sufficient to account for the 
overlying boulder-clay. Prof. Jas. Geikie, Mr. Craig, and 
Mr. Bennie, on the other hand, consider that part, at least, of 
this overlying boulder-clay is in place. The plants do not 
throw any light on the question, for they are all species still 
living in the district. 
Mr. Bennie has sent me a large number of specimens from 
this locality ; but Mr. Mahony has recorded several species 
that I have not seen, and I cannot now learn what has become 
of them. 
Older than any of the deposits already mentioned, there is 
another bed with Salix polaris and other arctic plants lying 
at the base of the whole of the glacial deposits of Norfolk, 
and proving the existence of very arctic conditions previous 
to the formation of the first till or boulder-clay. This was 
first discovered at Mundesley, in Norfolk, by Dr. A. G. 
Nathorst. Afterwards, by following his instructions, I was 
enabled to add a few other species, including Betula nana , and 
also to trace the same plants in two fresh localities — at 
Beeston, three miles west of Cromer, and at Bacton, four 
miles south of Mundesley 2 . At present this bed has not 
been traced beyond the Norfolk coast. 
1 Trans. Geol. Soc., Glasgow, vol. iv. p. 17. See also J. A. Mahoney, Organic 
Remains found in Cowden Valley, in Geol. Mag. vol. vi. p. 390. 
2 See Memoirs of the Geological Survey — Geology of Cromer, p. 83. 
