MIGRATION OF OUR BIRDS l6l 



White-breasted Nuthatch i, 9,10 Tree Sparrow, 22, 24. 



II, 13, 17, 18, 19, 22, 24, 26, 29. Snowflake, 8. 

 Hairy Woodpecker, 11. Herring Gull, 17. 



Total number of species seen, 9. 



February. 

 Birds seen on the dates after their names: 

 Blue Jay, i, 3, 9, 11, 17, 18, 20, Snowbird, i, 2, 3, 6, 7, 8, 11, 



24, 28. 13, 16, 17, 18, 27. 



Crow, I to 5, 7, 8, 9, II, 13, 14, Downy Woodpecker, 3, 18, 25. 

 15, 17, 19, 20, 21, 24, 25, 27, 28. White-breasted Nuthatch, i, 3, 

 Tree Sparrow, 16. 6, 8, 1 1 to 14, 16, 17, 19, 20, 



Snowflake, 2, 4, 5. 22, 24, 25, 27, 28. 



Northern vShrike, 15. Bluebird, 19. Brown Creeper, 24. 



Total number of species seen, 10. 



March. 



Birds seen on the dates after their names: 

 Blue Jay, i, 8. Snowbird, 2, 3, 4, 6, 7, 8. 



Crow, I, 4, 5, 7, 8. Downy Woodpecker, 8. 



White-breasted Nuthatch, 6, 7, 8 Tree Sparrow, 3, 4, 8. 



Total number of species seen, 6. 



Total number of species seen during the winter, 15. 



Comparative Migration of Our Birds in Spring. 



BY BROTHER ALPHONSUS, C. S. C. 



In the first three years, 7 days were the greatest difference 

 between the earliest and latest arrival of the Bluebird. In 19 12, 

 the date given, I think, was not the correct one; for I heard that 

 the species had been seen sooner by other observers. Although I 

 admit that my record was likely later than the true date of migra- 

 tion, still the fact that I did not observe the species until that date 

 indicates that the very cold weather of early spring was the cause 

 of the great scarcity ofthe Bluebird until late in March. 



In the four years of our comparison, the greatest difference 

 between the earliest and latest arrival of the Robin was 17 days. 

 The fourth year being the one in which this species was 10 days 

 later than in 19 10, and 12 days later than in 1909, the usual time 



