Carl Linnaeus stayed on Gotland for about a month, and then returned to Uppsala. During this expedition, they found 100 previously unrecorded plants. The observations from the expedition were later published in ', written in Swedish. Like ', it contained both zoological and botanical observations, as well as observations concerning the culture in Öland and Gotland. During the summer of 1745, Linnaeus published two more books: ' and '. ' was a strictly botanical book, while ' was zoological. Anders Celsius had created the temperature scale named after him in 1742. Celsius' scale was inverted compared to today, the boiling point at
Temperature which implies Since the first function is independent of "T", this temperature must cancel on the right side, meaning "f"("T","T") is of the form "g"("T")/"g"("T") (i.e. "f"("T","T") = "f"("T","T")"f"("T","T") = "g"("T")/"g"("T")· "g"("T")/"g"("T") = "g"("T")/"g"("T")), where "g" is a function of a single temperature. A temperature scale can now be chosen with the property that Substituting (4) back into (2) gives a relationship for the efficiency in terms of temperature: For "T" = 0 K the efficiency is 100% and that efficiency becomes greater than 100% below 0 K. Since an efficiency greater than 100% violates the first law of thermodynamics,