+ 
om 
Who the stranger is, whence he came, and how he got 
here, are questions of considerable scientific interest ; but by 
what means he is to be got rid of, is the practical question. 
With your permission I will discuss these points in another 
communication. 
Yours obediently, 
Ely, August 11, 1852. W. MARSHALL. 
P.S.—As I am anxious to know how far the plant has 
spread itself through the rivers of the Eastern Counties, if 
any of your readers residing in the Middle Level, or on the 
banks of any of the tributaries of the Ouse, would favour 
me with their experience, I should be greatly obliged. 
No. II. 
Sir, 
IT now trouble you with the second part of my communi- 
cation on the subject of this new . Water Weed, in which I 
promised to discuss, who the stranger is—whence he came— 
how he got here—and, by what means he is to be got rid of ? 
With respect to the first question it is sufficient to say, 
that it is the “ Anacharis Alsinastrum” of your eminent 
townsman, Mr. C. C. Basineron (to whose accurate labors 
our indigenous botany is so much indebted), who so named ~ 
it in 1848. 
The following is a short account of what we know of the 
plant:— | : 
It appears that it was first found in this country on the 
3rd August, 1842, by Dr. Grorcr J OHNSTON, of Berwick- 
on-Tweed, in the lake of Dunse Castle, in Berwickshire. 
The lake is situated upon a tributary of the Whiteadder 
River, which flows into the Tweed. Specimens were sent 
at the time to Mr. BaBincton; but the discovery was lost 
