Ferry — On Spring Migration. 



31 



TABLE SHOWING CONDITION OF PLANT LIFE FOR THE 

 SPRINGS OF 1906 AND 1907. 



The following- calendar gives in outline the progress of 

 the migration for the spring of 1907 with occasional notes on 

 vegetation, etc. The weather conditions were given for each 

 date in the hope that the influence of weather upon migration 

 could be thus shown. That this hope has not been realized 

 is quite evident, for the records clearly show that birds 

 migrate in all kinds of weather, paying little attention to 

 velocity or direction of wind or of temperature. To this 

 statement one marked exception is shown in that really great 

 migration movements usually take place during a high south- 

 west wind. For proof of this fact note the meteorological 

 conditions when the large migration waves occurred this 

 spring, March 16, March 28, May 12-17, May 22, May 35, 

 May 28. 



