becomes larger as the egg becomes older, so the freshness 

 of the egg is told by the yolk and the air space. The fertile 

 egg will show the developing germ, while no germ can be 

 seen in the infertile egg. (For illustrations see Iowa Exten- 

 sion Bulletin No. 25.) 



Conclusion : How many of the eggs examined were fresh? 

 What was the condition of the other eggs? Explain the use 

 of the germ in the fertile egg 



EXERCISE No. 46 

 EFFECT OF TEMPERATURE ON EGGS 



Object: To learn the effect of keeping eggs at different 

 temperatures. 



Material: Eggs that have been kept at temperatures of 

 35 and 70 degrees, and fresh eggs. 



Method : Candle, break, and examine. 



Conclusion: State the condition of eggs kept at each 

 temperature as compared with fresh eggs. 



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