152 
fandt jeg konvexe Facetter af ganske lignende Udseende som dem 
paa de yderste Ender af Spaanen Fig. 5, men under særlige For¬ 
hold. Den er nemlig stærkt ensidigt bearbejdet og næsten gennem- 
gnavet, saa at de to Stykker, hvori den skulde deles, tisidst kun 
var forbundet med hinanden ved et 22 mm bredt, men forholdsvis 
meget tyndt Mellemstykke, altsaa akkurat saa bredt, at Bæveren 
kunde gabe over dets Bredde og med et Par raske Bid overbide det. 
De her omtalte Iagttagelser drejer sig tilsyneladende kun om 
en Bagatel; jeg har dog ment at burde fremdrage dem, fordi de 
under visse Forhold kan faa Betydning, f. Eks. naar det ved Under¬ 
søgelsen af et fosilførende Lag drejer sig om at skaffe saa mange 
og saa tydelige Vidnesbyrd som muligt om Bæverens tidligere Til¬ 
stedeværelse i den paagældende Egn. 
Summary. 
On investigating the beaver-gnawed willow branches found in 
1914 in the early postglacial fresh-water beds at Nørre Lyngby in 
the cliff between Lønstrup and Løkken in the northern Jutland I 
found a few queerly shaped branches, the fashioning of which 
has only recently become clear to me. 
The ordinary „beaver-sticks“, that is, the trunks or branches, 
felled and formed by the beaver for use in its building, are gene¬ 
rally pointed, with several or only a few larger planes, in which 
the chisel-formed, slightly convex front of the incisors of the beaver 
has produced several flat concave facets, divided from each other 
by low, parallel ridges. Fig. 1 shows a beaver-stick of spruce {Pi- 
cea excelsa), V 4 of the natural size, from an interglacial bog in 
Tuesbøl Mark near Brørup in the Southern Jutland, and Fig. 2 a shows 
a beaver-gnawed branch of alder (Alnus glutinosa), V 5 of the natural 
size, from a post-glacial bog, Stevningen, north of Svendborg, Funen. 
In contradiction to these ordinary beaver-sticks, a few of the 
twigs found at Nørre Lyngby showed the peculiar faet, that the 
1) A. Jessen & V. Nordmann, 1915: Ferskvandslagene ved Nørre Lyngby 
(The fresh-water beds at Nørre Lyngby). With an English summary of 
the contents. Danmarks geolog. Undersøgelse II. R. Nr. 29. 
