On his return to Holland, which took place in September, Linnaeus continued his researches with increased diligence. In the course of the year 1737, he laid before the scientific world about two hundred printed sheets, not of compilation, nor of fiction, but for the most part completely original. The Genera Plantarum, containing the characters of all the genera of plants according to the number, form, situation, and proportion of their organs of generation, was the first work published by him after his return from England. This treatise exhibited 935 genera, to which were added during the same year sixty others, in a supplement, to which he also appended a concise view of his system. A full account of the plants observed by him in Lapland, arranged according to the method invented by himself, formed his next undertaking. It was dedicated to the Royal Society of Upsal, and contained a brief physico-geographical description of the country. At the solicitation of Gronovius, he permitted one of the productions of that northern region to be named after himself, _Linnaea borealis_. The great object of his residence at Hartecamp was now completed by the publication of his Hortus Cliffortianus, in which were described all the species of plants cultivated in the burgomaster's garden. The Critica Botanica, in which he attempted to reform the absurd nomenclature that then prevailed, and the Viridarium Cliffortianum, describing the greenhouse-plants of Cliffort's establishment, were the other books published by him during this year. Boerhaave, who had been in a great measure the author of his good fortune in Holland, now procured for him the appointment of physician in ordinary to the Dutch colony of Surinam, which, however, he declined, both on account of the insalubrity of the climate, and because he could now entertain the prospect of a more eminent station. He therefore recommended a young friend named Bartsch, who died in six months after his arrival in South America. When about to depart from Leyden, Linnaeus went to take leave of Boerhaave. The interview, which, however melancholy, was very flattering, is thus related by him: "That great man, who was affected with a dropsy of the chest which forced him to keep himself always sitting in his bed to prevent suffocation, would not receive visiters, but admitted me to bid him farewell. Summoning the little strength that remained in him, he raised my hand to his lips, and said: 'I have finished my career, and all that I have been permitted to do I have done; may God preserve you, who have yet a greater task to perform! What the learned world expected from me it has obtained; but it expects much more from you, my dear son. Farewell, farewell, my dear Linnaeus!'"