Mr. R. Collett on Phylloscopus borealis. 221 
composed of some dry birch-leaves; the outside consisted of 
coarse straws and moss, the interior of finer straws, but 
without a trace of hairs or feathers. The number of young 
birds in the first was seven, in the other six. Each brood 
was about nine days old. 
The third nest (July 28th) also lay on a high slope covered 
with birch trees, protected by a thin branch of juniper and 
surrounded mostly by Cornus suecica , while the other tall 
forest plants here were absent. This nest was thus somewhat 
exposed. Like the others, it was domed and loosely put 
together, inside with fine straws, outside of larger, but never¬ 
theless soft, straws, as well as a good deal of two kinds of 
moss which covered the ground in the immediate neighbour¬ 
hood, viz. Hylocomium splendens , Hedw., and Dicranum sco- 
parium , Hedw. The number of young was six, nearly ready 
to fly*. 
In these three nests the first eggs must have been laid 
about July 11th, 10th, and 9th; the number of eggs were 
seven, six, and six respectively. The distance between the 
first and second nest was about three kilometres, between the 
second and third about one kilometre. 
Whilst the females are sitting, the males have each their 
singing-place, which they hardly ever leave. It was on a 
little hill within the woods covered with larger birch and a 
few pine trees which towered above the others. Here the 
male would sit, in the top of the loftiest trees, and sing 
almost incessantly the whole day; it stopped only for a 
few moments, when it generally entirely disappeared, and 
sometimes it could then be seen to meet the female. Some 
minutes after it would perch again on the top of its tree, as 
a rule on the same branch, and recommence its song again. 
The singing-place is undoubtedly at some distance from 
the nest; as previously stated, my friend and myself could 
never discover a trace of the nest there, although the ground 
around was most carefully searched. The singing male did 
not take the least notice of our presence, and never by a move¬ 
ment or change of note did it exhibit the slightest anxiety. 
* This brood is now mounted in the University Museum, Christiania. 
