Notes. 
66 1 
We may, I think, conclude that in a bacterial cell there are two 
different substances to be recognized — a nuclear substance and a cyto- 
plasmic substance ; that the nuclear substance has a definite structure, 
which is found in principle in all bacterial cells, and which plays an 
important part in the division of the cell; but that it is simpler in 
structure and form than the nucleus of the higher plants and animals. 
HAROLD WAGER, Leeds. 
THE WEALDEN FLORA 3 . — The Wealden strata of Surrey, 
Sussex, Kent, and the Isle of Wight have long been familiar to 
geologists as the delta-deposits of a large freshwater, or possibly 
brackish, lake of Lower Cretaceous age. Bones of Iguanodon and the 
remains of other fossil animals were discovered in these beds many 
years ago, and latterly fragments of a genus of Mammalia have been 
described from Wealden strata. The vegetation which grew on the 
land bordering the lake has hitherto been known to us in the form of 
a few meagre specimens of Pteridophytes and Gymnosperms preserved 
in the delta sediments. 
During the last few years there have been discovered in the Wealden 
rocks of the Hastings district numerous and clearly preserved examples 
of this interesting flora, and, thanks to the energy and enthusiasm of 
Mr. Rufford, the Wealden flora is now much more fully represented 
in the collections of the National Museum. 
In a short note 2 , it is impossible to do more than enumerate the 
species which have been determined from the material in the Rufford 
collection, with the addition of those first described by Stokes and Webb, 
Mantell, Carruthers, Gardner, and others. The following list includes 
such British species of Wealden plants as are at present known, 
but we may confidently expect that fresh material will soon be acquired 
from the rich plant-bearing strata of Ecclesbourne and Fairlight. 
Algae: Algites valdensis , sp. nov. ; A. catenelloides, sp. nov. ; Char a 
Knowltoni, sp. nov. Hepaticae : Marchantites Zeilleri , sp. nov. 
Pteridophyta : Equisetites Lyelli , Mant. ; E. Burchardti , Dunk. ; 
E. Yokoyamae, sp. nov. ; Onychiopsis Mantelli , (Brong.) ; 0. elongata , 
(Geyl.); Acrostichopteris Ruffordi, sp. nov.; Matonidium Gopperti , (Ett.); 
Protopteris Witteana , Schenk; Ruff or dia Gopperti { Dunk.); Cladophlebis 
1 Read before the Botanical Section of the British Association at Ipswich. 
2 For a fuller account of this flora see Fossil Plants of the Wealden (British 
Museum Catalogue), Part I, 1894, and Part II (in the Press). 
