Individual Exercises for the Spring Term 



Five sliuliis follow, \vhich, like those for the I'all Tcnn 

 (pages 126 ct seq.)y are intended to be made by the student 

 working alone. The first three may be entered \\\)o\\ early 

 in the term (in our latitude); the other two are for the 

 latter half of the term. 



Optional Study 6. A Calendar of Bird Return 



This study is a\ailable only to those who know the birds 

 at sight, or who are willing to take the necessary trouble 

 outside of this course to really make their acquaintance. 

 Doubtful identifications will render the record quite worth- 

 less. Permission to offer this record wall therefore have to 

 be obtained in ad\'ance of midertaking the work. 



The object of this study is to give opportunity for extend- 

 ing personal acquaintance with our local migratory birds 

 on the part of students who already know them by sight. 

 Field observations, made at least once a week, may con- 

 veniently be entered in a cross-ruled table having the left- 

 hand colimin reser\'ed for bird names, and each of the other 

 colunms de\'oted to one da}-'s observ^ations, the date, time of 

 day, and relevant weather conditions being written at the 

 toj). Following each bird's name, there should be written 

 in the jjrojxT date colunms, the obsen-ations made uj^on it: 

 number and sex seen at first appearance; arri\'al of sexes, 

 and of young birds, separately; arrival of "waves" of 

 migrants; etc. 



