I. The Explanation. 
In the practice of mutual aid, which we 
ean retrace to the earliest beginnings of evolu- 
tion, we thus find the positive and undoubted 
origin of our ethical conceptions; and we can 
affirm that in the ethical progress of man, 
mutual support — not mutual struggle — has 
had the leading part. 
P. KROPOTKIN, Mutual Aid a factor of evo- 
lution. 
n 1914, the first part of my work on the heathen East Greenlan- 
ders appeared under the general title of “The Ammassalik Eskimo” and 
with sub-title: “Contributions to the Ethnology of the East Greenland 
Natives”! The first portion of this volume consisted of an English 
translation of an earlier work on the Ammassalimmiut, by Kommandør 
Gustav Horn, the discoverer of the region in question, containing also 
some papers by various other writers dealing with the same Eskimo 
tribe. The volume closed with my description of the ethnographical 
collections from East Greenland affording illustration of the culture of 
this same people; the collections themselves are preserved in the Ethno- 
graphical Department of the National Museum at Copenhagen. My de- 
scription of these, which was mainly intended as a broader exposition 
of Horm's previous commentary on his ethnographical collection, was 
supplemented by material from my own and other collections and obser- 
vations from the same part of Greenland. 
In an Introduction to this detailed description, I proffered some 
explanatory remarks concerning my preliminary studies, and the col- 
lections which I had consulted. I took the opportunity also, of expres- 
sing my thanks to the Museums concerned, in the following words: 
“My thanks are due to all the Museums I have visited for the facilities 
offered me. It is with pleasure that I remember my visits to the ethnographi- 
cal Museums in Berlin (1904, 1907 and 1912), Vienna (1908), Christiania (1908), 
Stockholm (1908 and 1910), London (1909) and Dublin (1909). Among these 
Museums I was obliged naturally to pay special attention to Stockholm’s Riks- 
museum owing to its excellent collections from Greenland connected with the 
names of Prarr (North-West Greenland, inventory completed 1878), N. 0. 
1 In Meddelelser om Grønland, Vol. XX XIX, Copenhagen 1914. 
