40 Trans. Acad. Sct. of St. Louis 
below freezing, and for several minutes fight Boreas above that 
they might release the terrific energy that impelled them to song. 
Violent winds, on the whole, whether cold or mild, checked aerial 
song though rarely inhibited it altogether. Quiet, clear days 
were made much of but flight songs were as frequent, perhaps 
more so, when light clouds overcast the sky. Observations were 
made and records obtained on all of these points but opportunity 
has not presented itself, as yet, to reduce them to definite tables. 
Variations in song through a nesting period—Here again 
no definite statistics can be produced to show the relative num- 
ber of songs of the male during the period when eggs were in 
the nest as contrasted to the period when young were in the 
nest. The chief difficulty lay in the fact that, in flight songs for 
instance, it was impossible to identify the individual. Also, 
both at Evanston and at Ithaca, there were nests with young, 
as well as nests with eggs, in the same region at almost all times 
during the breeding period, so that the total number of songs 
was not materially influenced by the condition at any one nest. 
Some general observations indicated that the period of most 
vigorous song was that of nest building, egg laying and ineuba- 
tion and, since the male assisted in feeding the young, the period 
of least singing was that when young were in the nest. For 
evidence of this compare the table of activities of the male when 
eggs were in the nest (Table 15) with the activities of the male 
when young were in the nest (Table 17). This latter male did 
no singing from the ground that was noted and indulged in but 
one or two flight songs as far as could be ascertained. 
Variations in song throughout a day.—By referring to Table 
15 it can be seen that ground songs are distributed with remark- 
able regularity throughout the entire day, but there is some eVi- 
dence in this table and from other observations that a majority 
of the flight songs came toward noon, and again near sundown, 
though they were delivered at other times as well. It is with 
regret that I acknowledge insufficient data also on this point. 
Part of the difficulty is that the majority of visits were made, 
of necessity, in late afternoon. 
The relation of the song of the Lark to that of other birds.— 
How the Lark compared with the morning chorus in time of 
— his song and with what company he closed his choral 
efforts is a matter of considerable interest. Observations made 
