At his suggestion, Johann Amman left Hans Sloane in London to take up a post in St Petersburg. The final two volumes of Johann Christian Buxbaum's (1693–1730) Centuria were published posthumously by Gmelin.[2]
Gmelin was elected one out of three professors to join Vitus Bering’s Second Kamchatka Expedition (1733–1743). During the early part of the expedition - leaving St Petersburg in August 1733 - he was accompanied by the young student Stepan Krasheninnikov. They travelled together through the Ural Mountains and western Siberia to Yeniseysk. He described the position of the Yenisey river as a boundary between Europe and Asia and participated in measuring the lowest temperature ever recorded at Yeniseysk. He was also the first person to measure the fact that the level of the Caspian Sea was below that of the Mediterranean Sea. He eventually reached Bering’s headquarters at Yakutsk in September 1736. Unfortunately, Gmelin's residence burned on November 8, destroying all his natural history collections and notes plus part of his library. The subsequent summer, he made as many re-collections of specimens as possible to replace the loss. His Flora Sibirica (1747–1769)[3] was based on his observations and collections. It contains descriptions of 1178 species, 294 of which he illustrated. His nephew Samuel Gottlieb Gmelin assisted him in editing the final two volumes. A fifth volume of Flora Sibirica, mainly on cryptogams, was written by Stepan Krasheninnikov, but was never printed. Gmelin also described the journey in his Reise durch Sibirien von dem Jahr 1733 bis 1743 (1751–1752).[4]
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