WHITE-THROATED SPARROW iii 



ber of days. But, as a new migration 

 movement generally overlaps a remnant 

 from a previous movement, it is not easy to 

 determine definitely the length of stay of 

 individuals. An interval sometimes occurs 

 after the first birds arriving in April have 

 passed on before the more continuous 

 movement of coming and passing takes 

 place, but after this has set in in early May 

 there have been few days when White- 

 throats have been entirely absent. The 

 season of 1903 was an exception, for there 

 were only four appearances of the species, 

 each time for a single day only, and but 

 eight birds in all were recorded, and yet the 

 time of migration covered was thirty days. 

 The movements of the seasons of 1905, 

 1906, 1907, and 1908 were notably larger 

 than those in the previous five years. The 

 White-throats often sing in the early morn- 

 ing their peculiarly peaceful song. 



In October the southward migration is 

 always manifested in the Garden. It con- 

 tinued in the years 1904, 1906, and 1907 to 

 November 4 and 5. In 1903 the autumn 



