42 BIRDS OF THE 



gates: in 1900, 528 migrants; in 1901, 161 

 migrants; in 1902, 347 migrants; in 1903, 

 176 migrants; in 1904, 164 migrants; in 

 1905, 601 migrants; in 1906, 255 migrants; 

 in 1907, 668 migrants; in 1908, 360 mi- 

 grants. 



If the whole month of May be regarded, 

 or indeed the entire spring season, the years 

 remain relatively the same. These figures 

 indicate a considerable difference in the 

 seasons and show that 1900, 1905, and 1907 

 were seasons when the migrating birds were 

 numerous in the Garden, while in the sea- 

 sons of 1901, 1903, and 1904 the birds were 

 few, and that the seasons of 1902, 1906, and 

 1908 were intermediate between conditions 

 of abundance and scarcity. These varia- 

 tions may be due to weather conditions 

 and other natural causes, such as might be 

 expected to have their influence in deter- 

 mining the exact pathway of the birds and 

 their choice of the Garden as a resting-spot. 

 Or the variations may be due in some de- 

 gree to destruction of bird-life by storms 

 or other hostile agencies, which have deci- 



