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did I desire that summer, that I could extend these labours to foreign lands, 

 but my slender means denied the wish ; nor in those times (O happy ye who 

 are students in this later day !) could any hope be cherished of a public grant or 

 salary, so that I was not able to prolong my journeys further than my pedestrian 

 powers allowed. With perfect health, and a tall agile frame, it was not a 

 matter of difficulty with m» to walk fifty miles a day. But in the year 1824, 

 when I was exploring Middle Sweden for the special sake of illustrating the 

 lichen-records of Swartz, Wallroth, and Acharius, while coasting the strand 

 of Roslay in open boats day after day, and in storms of thunder and rain, I 

 was attacked with severe illness, and continued to be an invalid for a whole 

 year. Losing all hope of convalesence, I completed my "Catalogue of Plants 

 of the Fenisjo District" (includging Fungi), in memory of my natal soil ; and 

 then, for the purpose of making public several fresh discoveries, together with 

 the systematical views I had newly formed, I dictated to my friend N. C. Ahnf elds 

 my "System of the Vegetable World." With the following autumn, however, 

 and the re-appearance of the Funguses, my health became restored, and I was 

 able to re-commence my former excursions ; so that by the winter I had 

 thoroughly investigated the Auriculini, a class too little noticed. At this period 

 immense quantities of the Fungi were sent to me from all countries, and I was 

 daily occupied for a while with their examination. Such as were new I have 

 described in the "Elenchus." But when Meyer and Wallroth with great noise 

 and objurgation laboured to subvert utterly the lichenological system of Acharius, 

 whose doctrine I maintained in its fullness, I devoted an especial study in 1826-27 

 to Lichens, for which group of plants I had preserved all my youthful fondness, 

 and I also prepared several editions of the " Hortus Siccus of Swedish Lichens" 

 (the first edition of collection 1-3, including a new division of genera, appeared 

 in 1817), with the intention of founding, when the series should be com- 

 pleted, a permanent record of my principal groups. In 1828 I visited Germany, 

 and devoted much time to the Berlin Museum. On my return I put in order the 

 first section of vol. 3 of the "System," and in the following year the "Select 

 Fungi " from the Berlin Museum, and the collection of my old friend Kunze. 

 These finished, I was busied in digesting the " Europaean Lichenology reformed." 

 At the entreaty of my publisher, however, I was compelled in 1831 unwillingly 

 to concentrate my attention on the last section of the "Mycological System," 

 when Kunze, who had undertaken to complete this portion, declined the task. 

 This is the reason why the amphibolic and truly versiform productions it treats 

 of (many, such as the Uredines, with an individuality utterly ignoble, for whose 

 delineation I would waste neither time nor paper) have been so summarily 

 enumerated by me. 



During the next few years, though engaged in other matters, I preserved 

 the habit of gathering the more remarkable Hymenomycetes. I discovered 

 many, but I preferred to withhold their description for the opportunity of a 

 general publication, rather than scatter them abroad piecemeal ; for I have often 



