362 ON ANACHARIS ALSINASTRUM. 
which joins the river by a lock near the bridge, and, after walk- 
ing about half a mile along the canal-side, came upon a few small 
patches of the plant, each about one foot in circumference. Con- 
tinuing then along the towing-path, and looking carefully mto 
every nook likely to shelter it without success, till I arrived at 
the tenth lock from Stratford, and about two and a half miles 
from the river, where there were a few small plants in the side 
reservoir of the lock, the level bemg about seventy feet above 
that of the Avon, then two locks (a quarter of a mile) further, and 
found three patches one or two feet square ; this was eighty-two 
feet above the river, and the last colony found, although I kept 
on for six miles further. Being at Evesham on the 10th of 
July, 1853, I looked for the Anacharis in the Avon there, but- 
the river being slightly flooded and the water muddy, could not 
see it, so obtained a pole and fe/¢ for it in the nooks and eddies 
it was most likely to have located itself in, and was soon re- 
warded by seeing some sprigs floating down from where I had 
been poking ; taking another and more careful dip, succeeded m 
landing a large plant. At the end of July, 1854, when again at 
Evesham, saw there was abundance in all the shallow water near 
the bridge. About the middle of August, 1853, found the plants 
from the tenth to the twelfth lock on the canal beautifully in 
flower, but could not find any further on towards Birmingham. 
When eleven miles from Stratford crossed to the Warwick and 
Birmingham Canal, proceeding towards Warwick, but did not 
find any Anacharis till I got to Hatton, about three miles from 
Warwick, where I found plenty in the side reservoir of one of 
the locks. This must have come from Warwick, where the plant 
had been known some time, and, as at Stratford, had to ascend 
considerably to get there. In 1854 the Avon was freely colonized 
by it from Stratford to Evesham, and in many places growing 
as close together as it was possible for it to do; still there was 
no serious obstruction to navigation. The broken pieces floated 
freely in the Avon, which is moderately clear, but always sank 
in the canal, which is very muddy. The alarm felt after its redis- 
covery at Foxton locks is, I think, quite groundless, as in the 
Stratford and Birmingham Canal, the Oxford Canal from Rugby to 
Brinklow, and the Ashby-de-la-Zouch Canal, passing boats keep 
a channel clear of the Anacharis in the same manner as with the 
other aquatic plants. It is only in the little-used branches of the 
