17 
found in abundance. In certain spots a sward of Ulva existed 
which was largely composed of small plants attached to stones by a 
basal disk. Among these were others attached to mussels, being 
firmly held together and to the mussels by the byssus of the latter. 
On the grass above high-water line dried Ulva fronds were found 
everywhere in profusion, having been blown ashore by the wind. 
This part of the Test estuary appeared too wide and too exposed 
to conduct investigations on the effect of currents. 
A comparison was made of the algal flora at the mouth of the 
Test (near Redbridge) with that of the Itchen, and a considerable 
difference was found to exist. Records of the marine flora of these 
two rivers kept throughout the year, and extending over several 
* seasons would be of much interest. It would indeed be advisable 
for a number of rivers to be investigated in this way with a view to 
obtaining a knowledge of the species characteristic of purely 
brackish water, and those which indicate moderate or strong sewage 
pollution. For preliminary work such data would form a useful 
index to determine roughly the amount of pollution of a given 
stream. Much has been done on the microscopic flora of large 
rivers in connection with their self-purification by micro-organisms, 
but apparently little or nothing of a similar nature has been 
accomplished with the marine algae which occur at the mouths of 
such rivers. 
side a bay of quiet shallow water. ok and 
increase of Ulva-growth in this bay has been very marked, and in 
the opinion of several of the residents it 1s connected with the loss 
of current. If this be correct it confirms W ae spend 
been suspected, that tranquillity of water 1s specially Important in 
eteraphepcnant of Blea. The amount of weed that 1s actually 
B 
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