232 Scientific Intelligence. 
ration of bowing ; and the bow has been fastened to his foot by 
new machinery, which insures more powerful and steady execu- 
tion. Indeed, the whole of this machinery is now So construct- 
ed, that he can play both instruments for a very great length 
of time, without more fatigue than if he played only upon one. 
Nor is this all : for, by the very nice and accurate application 
of mechanism, wholly invented by himself, he can perform 
upon two violincellos at the same time ; and the one upon which 
he plays the principal strain, is so contrived as to have the 
power and tone of two played by different performers ; so that 
he may be said to play three violincellos, — the principal strain 
upon two, and the bass upon a third. Nor is this compass 
limited ; for the instrument upon which he plays the principal 
has a range of sixty-four semi-tones, and more could be added 
if necessary We understand that there is to be a public pro- 
menade for the benefit of Mr Watson, and we trust that the 
ingenuity of this very respectable individual will be well re- 
warded, 
35. Notice regarding the Expedition to explore the Sources 
of the Missisippi . — A letter from the Corresponding Secretary 
of the Lyceum at New York to It. K. Greville, Esq. mentions, 
that the party, which consisted of forty persons, had just return- 
ed, without having experienced a single accident, after having 
travelled in different directions about 6000 miles. They first 
proceeded to the Lakes Huron and Superior,- through which they 
passed, and from the bottom of the last-mentioned lake ascended 
a river to its source, which, with a small portage of a very few 
miles, brought them to the main branch of the Missisippi. This 
branch they ascended 300 miles to its source. They then (be- 
ing 2100 miles above St Louis) descended 900 miles to the Oui- 
soncin, a river emptying itself into the Missisippi from the east. 
This they also ascended to its source. From thence a small 
portage of four miles brought them to the head of a river emp- 
tying itself into Lake Michigan, the whole coast of which they 
carefully examined. They have corrected many gross errors 
in the topography of these hitherto almost unknown regions, 
and promise to add much to the zoology and geology of that 
country. The Falls of St Anthony, the height of which has 
been so much exaggerated, they have reduced to 70 feet, (the 
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