IV 
had done a considerable part, so that half of Part I. published 
here, is due to his pen, his MS. having had in some measure to 
be looked over. In him I lost a dear friend and a clever co-operator. 
Partly on account of his death and partly because of my time 
being but very limited to work at the Arctic flora in the following 
years, Part I. has not been published earlier. 
My late friend and I are under great obligations to Prof. 
Warming, for it was his proposal to start this work, and it 
was he who placed the collections of the Copenhagen-Universily- 
Botanic-Museum at our disposal, and through whose influence 
we obtained the aid of the Carlsbergfund. To the direction of 
this fund we tender our cordial thanks for its readiness in ren- 
dering us help. Further we offer our thanks to the directors of 
the various museums from which we have borrowed herbarium 
specimens for our researches, viz. Prof. VY. Wittrock of Stockholm, 
Prof. N. Wille of Kristiania, Prof. A. Fischer v. Waldheim of St. Pe- 
tersbourg, Prof. A. Engler of Berlin and Dr. O. Nordstedt of Lund 
(Sweden). 
Further I owe many thanks to Mr. A. Bennett, Croydon, for 
the revision of MS., to Mr. H. Fisher, Knaresborough, and Mr. Ove 
Paulsen, Copenhagen, for assisting in proof-reading, as well as to 
Mr. C. B. Clarke for his valuable informations about the Cyperaceae. 
I trust the little book will be of benefit to the many who 
study the plants of the Arctic regions, and that it may be as reliable 
and accurate as possible, though doubtless there are list of Arctic 
plants which have not come under my notice. I shall be much 
obliged for the pointing out of such short-comings, as well as for 
the sending of treatises, available for the composition of Part IT. 
Though any botanist, whether English or versed in English, at 
a glance will see that this work is written by foreigners, I trust the 
language to be sufficiently comprehensible to convey the use of 
the work. 
