LINNAEUS AND THE LINNEAN CLASSIFICATION. 55 



but he shortly afterwards exchanged this for the chair of 

 botany and natural history. 



The remainder of the life of Linnaeus may be passed 

 over here very briefly. He had now attained the summit 

 of his ambition; and except for the trouble caused him 

 by those almost inevitable controversies which attend the 

 work of all reformers, his life was now free from anxiety 

 and annoyance. For thirty-seven years he remained as 

 professor in Upsala, with the result that this university 

 became the acknowledged centre of botanical and zoo- 

 logical learning in Europe. Students came from all 

 European countries to attend his prelections; and many 

 of his .more enthusiastic pupils such as Hasselquist, 

 Forskal, Solander, and Sparrman subsequently undertook 

 extensive scientific journeys, by which our knowledge of 

 the fauna and flora of distant regions was largely increased. 

 Linnaeus did not allow prosperity to abate his scientific 

 ardour, or to interfere with his scientific labours ; and the 

 list of the works which flowed from his pen during this 

 period of his life would be an extremely long one. Of 

 his botanical treatises, the two best known are his 

 * Philosophia Botanica .' and his 'Species Plantarum.' To 

 zoologists, Linnaeus is best known by his 'Systema 

 Naturae/ which contained a classification of the whole 

 animal kingdom, and which, as has been seen, first saw 

 the light at Leyden in 1735. This classical work went 

 through no less than twelve editions during the 

 lifetime of Linnaeus, the last being published in 1766. 

 Linnaeus also wrote various medical treatises, none of 

 which, however, would have sufficed to give him enduring 

 fame. 



