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
Scale of temperature is the function of the temperatures only: In addition, a reversible heat engine operating between temperatures "T" and "T" must have the same efficiency as one consisting of two cycles, one between "T" and another (intermediate) temperature "T", and the second between "T" and "T". This can only be the case if Specializing to the case that formula_5 is a fixed reference temperature: the temperature of the triple point of water. Then for any "T" and "T", Therefore, if thermodynamic temperature is defined by then the function "f", viewed as a function of thermodynamic temperature, is and the reference temperature