318 PRODUCTIVE FARMING 



EXERCISE. Running an Incubator. (Fig. 203). In the 

 spring time, when the school-room does not get too cool at 

 night, run an incubator in the school-room. One may be 

 borrowed for the purpose, or the pupils may earn money 

 enough to buy one and supply the eggs and kerosene. Follow 

 directions carefully. Appoint certain pupils to attend the 

 incubator each day. Make a record form on large paper 

 or cardboard on the wall. Let this show each morning and 

 evening: (1) the temperature, (2) whether regulator is open 

 or shut, (3) condition of lamp, (4) who filled and trimmed 

 the lamp, (5) who turned the eggs. The chicks hatched may 

 be cared for at school for two weeks or taken to one of the 

 homes when one day old (Fig. 204) . United States Farmers ' 

 Bulletin 624 will be helpful. Either of the two types of 

 outdoor brooders shown in Figs. 196 and 197 can be made 

 by boys at home. 



EXERCISE. Color of Yolk. When the grain fed to hens 

 is chiefly oats the yolks are much lighter colored than when 

 they are fed corn, particularly yellow corn. Let this dif- 

 ference in color of yolk be shown at school by having eggs 

 brought from flocks fed in these ways. 



EXERCISE. Packing Eggs. Let pupils tell of the dif- 

 ferent ways they have seen eggs packed for market. Some 

 can tell of the ways they come from stores. Should the eggs 

 be washed, if dirty, before marketing? Should they be sorted 

 by size as apples usually are? Do you know of any markets 

 where the prices are higher for white-shelled eggs, or higher 

 for brown-shelled eggs? (See the method of packing shown 

 in Fig. 205). 



EXERCISE. Weight of Eggs. Weigh a dozen large eggs 

 and get the average weight in ounces. Weigh a dozen small 

 eggs and get the average weight. How many of the large 

 eggs does it require to weigh a pound, and how many small 



