144 BisHop ox Birds of the Magdalen Islands. [April 
available for making the observations. The general form of the 
curves will be seen to be very similar; the first increase always 
takes place in the middle of February; and the greatest increase 
during the last week of April and the first week of May; while 
the maximum is reached in the second week of the latter month. 
Finally, comparing curvesA and T and Band T, Fig. 2, we see 
that there is no remarkable resemblance between the temperature 
variation and the increase in the number of species; but quite a 
striking resemblance between the temperature variation and the 
number of species actually recorded. This is especially the case 
during the winter and early spring when it will be noticed that 
almost every sudden increase in the number of species seen was 
accompanied by a corresponding rise in temperature, and vzce 
Versa. 
Such investigations and comparisons as the above seem to me 
to form one of the most interesting branches of the study of bird 
migration; and though the observations here recorded are too 
few to establish any general laws, I think that similar investiga- 
tions carried on for a number of years would bring to light many 
important facts in regard to the subject, and would perhaps show 
that bird migration is much more regular than is generally 
supposed. 
NOTES ON THE BIRDS OF THE MAGDALEN 
ISLANDS. 
BY DR. LOUIS B. BISHOP. 
THE FOLLOWING list is compiled exclusively from notes taken by 
my friend, Mr. Robbins, and myself between June 21 and July 
18, 1887. The unfavorable weather during most of this period 
together with the time lost in travelling among the islands proba- 
bly caused us to overlook many species; but I am at a loss to 
account for our failure to find such birds as Ampelzs cedrorum, 
Empidonax minimus, Poocetes gramineus, and Parus atricap- 
tllus Which were found by Mr. Cory to be tolerably common in 
1878, particularly as both of us looked carefully for several of 
