Cambridge, Mass.
1909.
May 27
  We had no Cat birds in the garden last year
but one appeared there on the 11th of this month and
to-day I saw two birds together, no doubt a mated 
pair. The male was the first to come, and he has been
in full song ever since his arrival. Without exception
he is the very finest performer I ever listened to having
a great variety of notes and a remarkably strong, clear,
sweetly modulated voice. Contrary to a rule which I 
have hitherto found almost if not quite without exceptions
he frequently gives the same note twice and occasionally even
thrice in quick succession after the habit of the
Brown Thrasher. His delivery, however, is like that of
all his kind, less rapid than that of a Thrasher and
his voice is somewhat less loud. At morning and
evening when the neighborhood is comparatively quiet he makes
the Garden fairly ring. Thus far I have not heard him mimic
the notes of any other species of bird.
The male a superb singer.