Covert of 
Wood 
Thrushes 
Warbler 
migrating 
suddenly into full song. In a moment others took up the 
strain until five were singing at once. My companion, 
inexperienced in such matters, insisted that there were at 
least a dozen, a delusion natural enough under the circum¬ 
stances for these birds, as is their habit at such times, 
kept flitting restlessly from place to place so that, in 
the course of a minute or two their notes did actually come 
from at least a dozen different points. The effect was 
impressive beyond my powers <bf description. I have heard 
nothing to equal it before, even in these woods, for not 
only were the singers more numerous this evening than on 
previous occa.sions, but at the height of their concert they 
literally had the whole field to themselves, not a single 
note of any other species of bird being heard for the space 
of ten minutes or more. 
&ne f irst Whippoorwill sang at 7.35. I heard it 
only a few times after this. 
As I was walking home after darkness had fair-ly 
set in, a Warbler of some species passed over, lisping. 
This is the first migrant that I have heard at night 'with 
the possible exception of the Grosbeak at North Billerica 
on the evening of the 23rd. "7 
