1 he material on which the present work is based was given 

 to me for investigation by the Commission for the "Dan mark- 

 Expedition." 



The saltwater material consisted of (1) 13 samples of Algæ, 

 as follows: — 



Off Cape Ame'lie, 5 samples, preserved in glass vessels. The 

 localit}^ given in the text as "Off Cape Ame'lie." 



Danmarks Havn, 3 samples, of which two are herbarium-material, 

 and one in a glass vessel. The locality given in the text as "Dan- 

 marks Havu." 



Along the peninsula, Cape Bismarck, 1 sample in a glass vessel. 

 The locality in the text given as "Off Cape Bismarck." 



Koldewey 0, 4 samples, of which three are herbarium-material, 

 and one in a glass vessel. The locality given in the text as "Kolde- 

 wey Isl. " 



and (2) A series of samples from ice, all preserved in glass vessels, 

 6 in all, as follows: — 



76°20N.lat., 18°20 W. long., land -ice off Germania Land, 1 

 sample. Given in the text as "Land-Ice." 



75"14N. lat., 4°34W. long. The outer edge of the pack-ice, 4 

 samples. Given in the text as "Margin of the Pack-ice." 



75°14 N. Lat., 11°15 W. long., pack-ice, 1 sample. Given in the 

 text as "Pack-ice." 



The freshwater samples are the same as those given to Dr. 

 F. HÖRGESEN for investigation of the freshwater algæ. There are in 

 all 30 samples, partly preserved in glass vessels, and parth'^ dried, 

 in paper bags, but several of them contained such small quantities 

 of material that it proved impossible to obtain serviceable prepara- 

 tions from the uncleansed material, let alone to submit it to a che- 

 mical cleansing! The freshwater samples are distributed among the 

 different localities (the names of which are given unaltered in the 

 text) as follows: — 



16* 



