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to Swedexborg’s supposition tlie quantities of inflowing and outflowing
water would correspond to each other. But since Lake Venner during
only a few weeks can rise even as much as 0.89 m. Swedexborg supposed
that this could not be connected with the inflow or outflow, but must
be due to other reasons, and this the more, since other great lakes, like
Vetter and Bodensjö, were reported as acting in the same way. He
wished to find the reason in a deformation of the Lake’s surface, which
he considered to be higher at the centre than at the shores. When this
difference is equalized, the water is so to speak driven towards the shores,
which presents the appearance of a rising of the whole surface of the
Lake. The falling would depend upon a movement of the water in the
opposite direction.
Swedexborg’s calculations, however, as Sieger has shown, do not
bear examination. It was of course insufficient to calculate the quantity
of water in the outflow at only one single period of the year, and as
the calculation seems besides to have been made at a very low
water-level, the result was altogether too low. On the other hånd Swedexborg
estimated the area of Lake Venner as being from 6 to 7 times greater
than it actually is, as being 36558 square kilometers instead of 5568.4.
Both of these sources of error strengthened one another. Besides,
Swedexborg overlooked sucli weighty factors as rain and snow, and also
evaporation on the Lake’s own surface as w^ell as within the region of
its inflow. But his demonstration is, as Sieger emphasizes, strictly
logical, in spite of the error in the premises. »Da sich keine andere
Erklärung festhalten lässt, lag dem Mechaniker, dessen Geist gerade
damals mit grossen Veränderungen des Meeresniveaus erfiillt war, die
Annahme von Deformationen nahe; seine Beobachtungen aber schlossen
es aus, sich diese, ähnlich wie er es am Meere annahm, als Hin- und
Hergehen des Seespiegels zwischen entgegengesetzten Ufern aufzufassen.
So bleibt nur eine Deformation zwischen Centrum und Ufern
iibrig—eine wahrhaft kuhne Idee, in der Swedexborg den modernen Theorien
von der ’Continental-woge’ nahe kommt».
But if for this reason Swedexborg did not find the right solution of
the problem, another Swede, as Sieger points out, very soon saw the
con-nection between the water-level of the lakes and the quantity of rain and
snow. »Birger Vassexius sammelte Daten fiber Wasserstand und
Witte-rung und erkannte bald deren Zusammenhang. Zunächst in den 20:er
Jahren des vorigen1 Jahrhundertes leiteten ihn theoretische Grunde —
1 This was written in 1894.
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