76 THE NATURE-SI UDY REVIEW [6:3-Mar.,i9io 



from a point above it. The following points with others should 

 be noted by the class: 



a. Color of eggs. 



b. Form of eggs. 



c. Arrangement in nest. 



d. Interval of time between the completion of the nest 



and the laying of the first egg. 



e. Care given eggs by birds. Do they ever purposely 



move the eggs? Do both male and female sit upon 

 the eggs? 



f. Number of eggs in the completed set. 



g. Length of time between the completion of the set 



and the hatching of the eggs. 

 This study can only be made by continued observations 

 from day to day. 



Lesson VII. The Young Robins in the Nest 

 The methods of observation are the same as those men- 

 tioned in Exercise VI. The following points should be noted: 



a. Time of hatching. 



b. Form, color, and general appearance of young at 



time of hatching. 



c. Helplessness of young at time of hatching compared 



with chickens. 



d. Development of plumage. 



e. Changes of form due to growth. 



f. Length of time in nest. 



g. Care of young by parents. 



i. Food fed young. Identify and record the nature 

 of this as far as possible. The amount of food 

 given the young in a certain number of hours 

 may be determined by having pupils observe in 

 relays. 



2. Methods of keeping nest clean. 



3. Protection of young against enemies, such as cats, 



crows, and blue jays. 

 These observations must be made through a number of 

 days as were those in Lesson VI. Quizzes may be given at in- 

 tervals concerning nesting of robins. Special problems, some 

 of which may be suggested by the above topics on bird nesting, 

 may be assigned to certain pupils. These individuals may re- 

 port to the class what they have learned. 



