Ls 
eee | Mousey, Subsequent Nestings. 391 
this set, I visited the locality on many occasions in the hope of 
securing another set, but it was not until June 18 that I was fortu- 
nate in flushing the female off another (which I estimated was about 
two days incubated) only thirteen yards from the site of the first. 
These were counterparts of’ the first, just a shade thicker, and 
breaking the general rule by being five in number, instead of four 
as in the first set. Another interesting feature (already remarked 
upon) is that one egg in each set (I can only positively say it was 
the last one laid in the first case, as incubation had commenced as 
already mentioned in the other before I found it) differs from the 
others, the markings being much smaller and all over the surface 
with no pronounced blotches or scrawling of any kind. After the 
taking of the second set, I was unable to locate another nor did I 
come across the birds in the neighborhood again. 
We now come to the last, but by no means the least interesting 
example in the table, that of the Black-throated Blue Warbler 
(Dendroica caerulescens cwrulescens) and one which I was at first 
uncertain whether to include or not, on account of the great differ- 
ence in the size and construction of the nests, as well as in the shape, 
size and markings of the eggs, but after a careful weighing of the 
pros and cons of the case, I have come to the conclusion that I was 
really watching the same pair of birds and have therefore included 
them. The first nest was placed in the forks of a small maple 
sapling three feet above the ground, the second being in a similar 
position but only fifteen inches up, and ninety yards east from the 
site of the first, the outside depth of which was 4 inches, and was 
composed for the upper part of woven cedar or grape vine bark, 
whilst the lower portion was of loose white birch bark, the lining 
consisting of slender rootlets and some hair. The second was only 
24 inches in depth and was composed almost entirely of rotten or 
pithy wood (so characteristic of the species) held together by 
fibrous materials, and lined with fine black rootlets and black and 
white hair. The first set of eggs was pear shaped and minutely, 
spotted, whilst the second were more oblong and boldly marked 
the thickness however of each being practically the same, the differ- 
ence arising in the length as will be seen from the table, and in 
many ways they greatly resemble the two sets of the Northern 
Parula Warbler especially in shape, the first in both cases being 
