282 MB. C. REID ON THE NATURAL HISTORY OP ISOLATED PONDS. 
gone. Myosotis is not uncommon, but I have omitted to note 
whether the species was palustris or ccespitosa , or whether both 
occur. Scrophularia is rare, and has not been observed in ponds 
far from other water. Utncularia may have been overlooked 
owing to want of time, and the inconspicuous character of the 
plant when out of flower ; it has not been carefully searched for. 
Mentha , Lycopus, and Stachys palustris are often seen in ponds 
railed in so that cattle cannot get at them. The aquatic species of 
Polygonum occur frequently in horse-ponds by the road-side, but 
are uncommon in dew-ponds on the open Downs. 
Rumex maritimus was once found in an old moat (probably 
fifteenth century); it, however, is a species which from its burr-like 
fruit would be very liable to be carried by human agency. Of the 
other aquatic docks, I believe that Rumex liydrolapatlnyn has 
been seen in some of the larger ponds in old ballast-pits, but no 
note has been preserved of the localities. Oeratophyllum is rare in 
isolated ponds, only having been observed once. Eloclea has been 
found on three occasions in dew-ponds on the open Downs. 
Hydrocharis, though a common plant in the marshes of the Arun 
and other Sussex rivers, does not find its way to the dew-ponds ; 
it occurs in a pool in an abandoned brick-yard, where, however, it 
is associated with other handsome water plants, probably purposely 
introduced to make the brick-yard somewhat less unsightly. 
Both our species of Bulrush, and also Sparganium ramosum , and 
more rarely S. simplex, are found in ponds inaccessible to cattle, 
but none of these plants have been seen in the dew-ponds on the 
Downs. Lemna is common, though many of the more distant 
ponds are without it. The chalky bottom of a dew-pond, perhaps, 
does not suit Alisma plantago, for it is seldom found there, though 
sufficiently common in old sand-pits. Sagittaria and Butomus 
have only yet been noticed along continuous water-ways. 
Of the pond-weeds Potamogeton natans occurs rarely, the 
commonest species being P. densus, and some narrow-leaved forms 
which, not finding in fruit, I have not attempted to determine. 
Zannichellia has only been noted in the two instances mentioned 
in the early part of this paper, but when not in fruit it may have 
been overlooked among the other linear-leaved plants. 
No attempt has yet been made properly to determine the various 
Bushes, Sedges, and aquatic Grasses which soon make their 
