tale 
Proceedings. 15 
compiling of local floras; and even where there is really little 
difference in the vegetation of each river-basin, the system is 
nevertheless adopted as supplying a convenient natural division 
of a district. There is no doubt that seeds and roots get carried 
down and distributed by streams in a way that tends to make 
riverside vegetation more or less uniform and permanent 
throughout. In S8.W. Surrey this is shown along the Wey 
Valley. A remarkable instance of the spread of a plant by the 
agency of water is presented by Impatiens fulva (Balsam), 
which was planted in ponds at the head of the Tillingbourne 
Valley, and has spread down this stream to its junction with 
the Wey near Shalford, and from this point down the Wey 
nearly as far as the Thames, while, apart from this line, it 
occurs nowhere else in the country. This plant is adapted in a 
remarkable degree for this kind of distribution, for its small 
seed-pods are provided with highly elastic ribs which are the 
means of ejecting the seeds to some distance. As the Balsam 
usually overhangs the water, most of them fall on its surface, _ 
on which they float and get carried to new localities. 
The paper was illustrated by diagrams showing the distribu- 
tion of certain typical species. 
Mr. A. J. Crosfield mentioned that he had found Setaria 
viridis in a field in which gravel is quarried between Burford 
Bridge and Dorking. 
Mr. C. E. Salmon read a paper on 
PLANTS FOUND NEAR TIGHNABRUAICH, ARGYLLSHIRE. 
Mr. Salmon exhibited beautiful specimens of most of the 
plants named in his paper. 
Evenine Mexrine, held at Reigate, 19th of January, 1894. 
Miss Martin read a paper entitled 
Natura History WANDERINGS IN ALGIERS. 
