50 A UNIT IN AGRICULTURE 



for the j,'iv:it siivn^th <f the shell. Hre;ik ;i fn-sh uncooked egg in a 

 saucer or plate by separating the shell in the middle. Observe: 



1. The germinal disc (a light colored spot usually found on the 



upper surface of the yolk). What is the function of this 

 part? 



2. The transparent albumen or white of the egg. 



Examine the shell and find the air space. Where is the air space ? 

 Of what use is it? Observe the two membranes best seen at the air 

 space where they separate. 



Examine a piece of the shell with the microscope, and observe the 

 pores. What would be the effect on the chick while in the egg if the 

 shell were covered with varnish? 



Note the color of the egg. Ascertain whether the eggs from any 

 particular hen are all of the same color. 



Boil the egg and carefully cut lengthwise through the middle. Ob- 

 serve all closely and make drawing. of either half, showing and naming 

 all parts. Make an exact drawing, omitting nothing. Use colored 

 crayon, if convenient. 



Ex. 56. Poultry House. 



Read Farmers' Bulletins, Nos. 225, 227. Make drawings accord- 

 ing to scale of (a) floor plans: (b) cross section of poultry house for 

 a given number of chickens. 



