242 



FIRST LFSSONS IN ZOOLOGY 



of the birds in the fall. A series of such records, covering 

 a few )'ears, will show which are the earliest to appear, 

 which the later, and which the last. Such records of 

 appearance antl disappearance should also be kept for the 

 summer residents, those birds that come from the South 

 in the spring, breed in the locality, and then depart for 



Pig. 197. — Yount^f bcirn-owl^. (Pl)ot'iL;ru))Ii Ijy (jCo. Towiil- ; perniisbiun of 

 The Coii.lor.) 



the Sriuth again in the autumn. Notes on the kinds of 

 days, as storm\', clear, cold, warm, etc., on ^^•hich the 

 migration seems to be most acti\-e ; on the greater prev- 

 alence of migrator)^ flights 1j_\' da)' or b)' night; on the 

 height from the earth at \\'hich the migrants fl_\', etc., are 

 all worth while. For an excellent simple accoimt of 

 migration see Chapman's " llird-Life, " Cliajiter IV. A 

 book about migration, and one gix'ing the records for 



