2jb MR. W. A. NICHOLSON ON BOTANY OF SUTTON. 
These plant-associations present some interesting problem.-. 
For instance, periodic examinations of particular dykes 
would show which plant tended to become dominant, and, 
possibly, to drive out others. Also, does Stratiotes rise or 
sink through Elodea, or carry it up and down with it by 
means of its pointed teeth ? 
The salinity of the water of Sutton Broad has been estimated 
by Mr. F. Balfour Browne at from 7 to 9 grains of chlorine 
per gallon ; but as far as one can gather from the nature of the 
flora, there is nothing specially to indicate nearness to the 
sea, except, perhaps, the occurrence of Samolus valerandi, L. 
This plant is generally found in maritime districts, and 
usually indicates present or former littoral conditions. 
For the purpose of comparison, it may be of interest to 
insert here a few records of plants occurring at about the same 
period of the year in the Hickling District. 
On the banks of Candle Dyke were found 
SciRPUS MARITIMUS, L. 
S. Tabernaemontani, Gmel. 
Both of these are maritime plants. 
In Heigham Sounds, many square yards of the surface were 
covered with Ranunculus circinatus, Sibth, in flower, in 
3-6 feet of water. This produced a striking effect in the 
distance, as the individual flowers appeared absorbed in one 
vast white sheet. Myriophyllum spicatum, L. was almost as 
abundant in other portions of the Sounds, the green flowering 
spikes rising 2-3 inches from the surface of the water. Both 
plants were associated with Hippuris vulgaris, L. in fruit, 
and Utricularia vulgaris, L. in flower. Phragmites here was 
higher than on Hickling or Sutton Broads, and quite im- 
penetrable in places. It had, I presume, not been cut 
recently. Typha ang-usli folia, L. occurred in considerable 
quantity. (Enanthe Phcllandrium, L. was observed, but 
did not seem to be abundant. Potamogcton interruptus, 
Kit. (=P. flabellatus, Bab.) was in flower and covered a large 
area. The aquatic form of Polygonum amphibium, L. was 
noted, and Char a vulgaris L. 
