-P- 
f 
\ 
r 
Method of Recording Bird Music, with a Correction. — In my arti- 
cles on the expressions of emotion in the Mourning Dove and the Passenger 
Pigeon (‘The Auk,’ October, 1911), in the musical notations I used sharps 
and flats in some cases to indicate a degree of sharpness or flatness less than 
a semitone. In the Mourning Dove record No. 1, the second note is only a 
trifle sharp; and the Passenger Pigeon records Nos. 4, 5, 7, and 8 each con- 
tain a downward run in which the intervals between successive notes are 
less than a semitone. I ought to have explained this in the original 
paper. 
To measure the tempo of a bird song, the best instrument is a stop-watch. 
While the bird is singing, count the beats of its song, “ Naught, one, two, 
three, ...” Start the stop-watch with “ Naught ” and stop it with “ ten.” 
This gives a very accurate result. If the beats be rapid, count twenty 
instead of ten. In absence of a stop-watch, I think the best one can do is 
to count the beats for five seconds, or some other definite number of seconds, 
by an ordinary watch; but this is far less accurate. — Wallace Craig, 
Orono, Maine. 
U i& !.!'>#• %■ 6~i/, 
a 
