MIGRATION 



MIGRATION BLANKS. Convenient migration blanks are 

 issued by the Biological Survey, and may be had on appli- 

 cation to the Biological Survey, Department of Agriculture, 

 Washington, D. C. 



The form of the blanks will be helpful for individual 

 notebook records. 



INSTRUCTIONS FOR USE OF BLANK (p. 368). 



In the first column should be stated the exact date when each 

 kind of bird was first seen. This entry should be made on the 

 day the bird arrives not from memory afterwards (general 

 statements such as ' late in March,' ' early in April,' etc., are of 

 no value). 



In the second column should be stated, with as much exactness 

 as possible, the number of each kind of bird observed during 

 the day it was first seen. 



In the third column should be stated the date when the same 

 kind of bird was next seen whether this happens on the very 

 next day, the next week, or not till a month later. 



In the fourth column should be stated the date when the bird 

 becomes common. Some birds come in a body and are common 

 from the day of their first arrival, while others straggle along 

 and are not common for a month or more ; and others still are 

 never common. 



In the fifth column should be stated the last date when the 

 bird was observed. In the SPRING MIGRATION this column will 

 remain vacant in those species which breed in the neighborhood, 

 as it can be filled only when all the individuals go north. In 

 the FALL MIGRATION it should be filled in those species which 

 pass farther south, but must remain vacant in those which spend 

 the winter in the vicinity of the station. 



In the sixth column should be stated whether the species is 

 abundant, common, tolerably common, or rare. 



