more than three quarters
of an hour; but, in addition to her speed before the wind, she is also
capable of beating well up to windward, requiring, however, an
experienced hand to manage her, in consequence of her extreme
sensibility of the rudder during her quick motion."--Martin's _History
of Canada_.

"The great earthquake that destroyed Lisbon happened on the 1st of
November, 1755, and on Lake Ontario strong agitations of the water were
observed from the month of October, 1755."--_Lettera Rarissima data
nelle Indie nella Isola di Jamaica a 7 Julio del_ 1503 (Bassano, 1810,
p. 29).

"From some submarine center in the Atlantic, this earthquake spread one
enormous convulsion over an area of 700,000 square miles, agitating, by
a single impulse, the lakes of Scotland and Sweden, and the islands of
the West Indian Sea. Not, however, by a simultaneous shock, for the
element of time comes in with the distance of undulation; and, together
with this, another complexity of action in the transmission of
earthquake movements through the sea, arising from the different rate of
progression at different depths. In the fact that the wave of the Lisbon
earthquake reached Plymouth at the rate of 2.1 miles per minute, and
Barbadoes at 7.3 miles per minute, there is illustration of the law that
the velocity of a wave is proportional to the square root of its depth,
and becomes a substitute for the sounding line in fixing the mean
proportional depth of different parts of this great ocean."--Humboldt.]

[Footnote 137: "There are two lakes in Lower Canada, Matapediac and
Memphremagog. The former is about 16 miles long, and three broad in its
greatest breadth, about 21 miles distant from the St. Lawrence River, in
the county of Rimouski; amid the islands that separate the waters
running into the St. Lawrence from those that run to the Bay of
Chaleurs, it is navigable for rafts of all kinds of timber, with which
the banks of the noble River Matapediac are thickly covered.
Memphremagog Lake, in the county of Stanstead, stretching its south
extremity into the State of Vermont, is of a semi-circular shape, 30
miles long, and very narrow. It empties itself into the fine river St.
Francis, by means of the River Magog, which runs through Lake
Scaswaninepus. The Memphremagog Lake is said to be navigable for ships
of 500 tons burden."--Martin's _History of Canada_, p. 102.]

[Footnote 138: "It is worthy of remark, that the great lakes of Upper