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occupied himself with meteorological observations, for which he
himself constructed all the instruments.
In this forlorn corner of the world he was visited by
the well-known academician, Fr. Schmidt of St. Petersburg,
who, after energetic endeavours, finally succeeded in
obtaining permission for him to devote himself exclusively to
scientific work. Commissioned by the East Siberian branch
of the Imperial Geographical Society, he now made very
important geological explorations in the province of Yakutsk
during the years 1870–71. In 1872 he worked out his
great plan of investigating the unknown river-systems
between the Yenisei and the Lena, and in the same year he
was commissioned by the above-mentioned society to
undertake an expedition which was to last for two years.
During the first year he was to explore the valley of the
Lower Tunguskaya, and in the second the river Olenek.
For this work he was granted the inadequate sum of 3000
roubles. To this expedition was joined the astronomer,
T. F. Müller, and 700 roubles were added for him, besides
which he received 900 roubles from private parties. With
these small means Tschekanovsky carried out his plan in
its entirety, and returned to Irkutsk in the beginning of
1876 with valuable results from his expedition.
Through energetic and persistent petitioning on the part
of various scientific societies, Tschekanovsky was finally
pardoned, and returned to St. Petersburg in the spring of
1876 in order to arrange and classify his rich material.
He also visited Sweden to compare his collections
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