92 Origin of the British Flora. 
Rumex. Zannichellia palustris. 
Urtica. Eliocharis acicularis. 
Quercus Robur. Scirpus lacustris. 
Sparganium. Carex riparia (?). 
Alisma Plantago. — rostrata. 
Potamogeton heterophyllus. — muricata. 
— trichoides. Phragmites, 
Ruppia maritima. 
SWEDEN. 
(Gunnar Andersson, ‘Svenska Vaxtvarldens Historia,’ 
8vo, Stockholm, 1896; and ‘Geschichte der Vegetation 
Schwedens, Exglers Bot. Jahrb. Bd. XXII, pp. 434-550. 
1806.) 
The extensive literature relating to Swedish Quaternary 
fossil plants has been brought together by Dr. Gunnar 
Andersson, who refers the deposits to the following five 
zones, all corresponding, apparently, with our late Glacial 
and Neolithic, no plant-bearing strata of Interglacial or 
of Preglacial date being yet known in Sweden. 
5 Spruce Zone. 
4 Oak Zone. 
3 Pine Zone. 
2 Birch Zone. 
1 Dryas Zone. 
No. 1 corresponds in all probability with the Arctic 
plant-beds of Hailes, Corstorphine, and Gayfield. 
As Dr. Gunnar Andersson records no fewer than 133 
species of flowering plants, the table is too long here to be 
reproduced ; but the range in Sweden, where it supple- 
ments the British records, is mentioned in the next 
Chapter under the heading of each species. 
TILBURY, ESSEX. 
(Spurrell, ‘On the Estuary of the Thames and its 
Alluvium,’ Proc. Geol. Assoc, Vol. XI., pp. 210-230. 1889.) 
