The following, brief description makes no claim, naturally, to be 

 an exhaustive account of the organic life in the freshwaters 

 (rivers, lakes, pools and bogs) in the regions (ca. 77° N. L., ca. 20° 

 W. L.), where the observations were chiefly made by the Danmark 

 Expedition in 1906 — 1908. For this the special reports on the animal 

 and plant forms discovered must first be available, and of these only 

 a part have been published (Ostenfeld and Lundager, "Vascular 

 Plants"; Børgesen, "Fresh Water Algae"; Hesselbo, "Mosses"; Jensen, 

 "Hepaticae"; Lind, "Fungi"; Østrup, "Diatoms" and Brehm, "Die 

 Entomostraca", in this series of publications). Further, the pro- 

 mised, general review of the flora (written by Lundager) has not 

 yet appeared, and this would have been of great usefulness in the 

 account of the conditions dealt with here. The reason why the 

 present contribution to the freshwater life in North-East Greenland 

 nevertheless appears at the present moment, is that some information 

 may already be given concerning the natural conditions of the fresh- 

 water in general and concerning the biology of a few of the larger 

 and more important animals in particular. These last Ьале indeed 

 been dealt with by Dr. V. Brehm in his paper above mentioned, 

 and I have cursorily touched upon the conditions outlined here in 

 my earlier paper Ч What was said there regarding the nature of 

 the land investigated (the temperature etc.) also applies naturally 

 for the present paper, and in A. L. V. Manniche's paper ("Mammals 

 and Birds") in this series a general description of the land will be 

 found, which along with the accompanying, excellent chart of 

 "Winge's Coast" (where a typical low-land locality with plenty of 

 water is represented) is of great interest for the conditions discussed 

 here, hi these two papers a number of figures are also given (figs. 1, 

 И and 4 in my own and figs. 2, 7, 9 and 10 in the part on the 

 mammals and figs. 9, 10, 11 and 17 in that on the birds), which 

 better than any words give an idea of the appearance of the North- 

 East Greenland lakes in the landscape. 



' Frits Johansen: General Remarks on the Life of Insects and Arachnids in 

 North-East Greenland. 



23* 



