tlie sounds which I attributed to them is beyond question. Equally 
certain is it that the cries which they gave at first were the 
same as those which I have heard so often at Lake Umbagog and which 
evidently represent the night call of the species. As far as I 
have observed it is uttered by the Yeery only at night and during 
migration, but this rule may be subject to exceptions for the cor¬ 
responding and closely similar call of the Hermit is sometimes 
given by day, even when the birds are still on their breeding 
grounds. x 
r 
