IMS 



COOKI 



Auk- 

 April 



little if any effect on the arrival of the birds. There were 253 days 

 when arrivals were noted at Lanesboro, Minn.. 18S5 IS93, ami the 

 wind the night before had been from the following directions: 

 west. 29 times, northwest 45, north 29, northeast 22, east 18, 

 southeast 27, south 51, southwest 24, calm S times. Combining 

 the directions, the sum oi the northwest, north., and northeast 

 winds is 96 times and the sum of the southeast, south, and south- 

 west. 109 times. Tims the birds migrated with the wind blowing 

 against them jnst about as frequently as with a favorable wind.. 

 It is especially to be noted that the percentage of each oi the winds 

 in the above table is \ery elose to the average percentage of the 

 time in the spring that the wind is in that direction. Thus the 

 birds arrived with a south wind. 51 times or 20 percent of the 

 times observed,. During the 828 days of March, April, and May. 

 L885 1893, the wind was south 161 days or the same 20 percent. 

 The birds arrived with a northwest wind IS percent of the times 

 anil the wind blew from the northwest 19 percent of the time. 



Direction of iho wind. 



West 



Northwest 

 North 

 Northeast 



Bast 



Son: 

 South 



Southwest 



Calm 



cent of a.;i>s the, wind 

 u this direc 



Percent of timos (he birds 



urrivovi with a wind from 



this direction. 



These figures show that when birds are moving north in the 

 spring they pay little attention to the direction of tin- The 



same conclusion was reached after an extended investigation of 

 the date of migration as observed at the lighthouses of southern 



Florida. The Biological Survey has the records for many j 



of each night in spring on which birds were noted passing the lights. 

 These birds are fresh arrivals in Flor a flight o- ean 



