x 3 2 
BIRDS OF THE MOUNTAIN TOPS. 
sideration are not without special influence on avian life can scarcely 
be doubted; and it seems highly probable that, in the case of several 
species found about the summit referred to, and not elsewhere in the 
same region, that their presence was due not alone to the altitude 
per se but also to the collateral conditions above depicted. 
Passing up the mountain side few birds were observed, but when 
the high ridge leading to the summit was gained their numbers in- 
creased, and about the summit the following species were noted : 
Olive-backed Thrush, 
Bicknell s Thrush, 
Hermit Thrush, 
Winter Wren, 
Black-capped Chickadee, 
Canada Nuthatch, 
Brown Creeper, 
Yellow-rumped Warbler, 
Black-and-yellow Warbler, 
Black-poll Warbler, 
It seems strongly probable that the presence of some of these birds 
was governed, in a measure at least, by the dampness and humidity 
of the situation. From what is known of the breeding habits of the 
Black poll Warbler and the Yellow-bellied Flycatcher, it seems evi- 
dent that low swampy situations are their favorite haunts during their 
season of reproduction; and it is probable that considerations of hu- 
midity in surroundings influence, in a greater or less degree, others 
of the species mentioned in the choice of a breeding resort. 
That so many birds should have found their way to so remote and 
isolated a situation when it is not probable that all reached it by di- 
rect migration, is an interesting fact, and may for a moment be 
dwelt upon. In a recent paper by the writer* allusion is made to 
the gradual awakening of the birds at the top of Slide Mountain. 
Black-throated Green Warbler, 
Mourning Warbler, 
Purple Finch, 
Red Crossbill, 
Slate-colored Snowbird, 
Blue Jay, 
Yellow-bellied Flycatcher, 
Hairy Woodpecker, 
Red-tailed Hawk. 
Previously cited, 
