54 Lessons in Nature Study. 



to cut the yolk. Can you find the thin sack that covered 

 the yolk and kept the yellow from coming out when the egg 

 was raw ? Look carefully. Yes, here is some on the yolk, 

 and there is part of it on the white in the little round hole 

 where the yolk lay. Only see how thin it is ! Now can we 

 find the little spot which we found yesterday on the upper 

 side of the yolk ? 



Yes, Charlie, you found it first. Now we will try to find 

 how this yolk looks inside. I will cut it right through the 

 centre of the little round spot with this sharp knife. Now 

 see how the egg-yolk is made up inside. What is in the 

 centre ? Which part of the yolk is boiled hardest ? Which 

 part is still soft ? See the layers around the soft middle. 

 What shape are they (vase-shaped) ? What has boiling 

 done to the yolk ? What can we say heat does to an egg ? 



It changes the white , and the yolk . Did you 



ever see mamma break an egg into a hot pan on the stove ? 

 What happened ? 



III. Experiments. 



If I beat the white of the egg with a fork, what will 

 happen ? 



I put this fresh egg in some vinegar yesterday, and 

 left it until to-day ; what has it done ? Where has the 

 shell gone ? 



Here is some alcohol. I will put some on this little piece 

 of white of egg. What does it do to it ? Little boys and 

 girls have brains something like white of egg, and when 

 they drink whiskey, or wine, or beer, or cider it does this 

 same thing to their brains. We do not want to have our 

 brains cooked with this nasty alcohol, do we? Then we 

 must let all kinds of drinks alone, so as to save our brains 

 from being spoiled by them. Take a piece of this lining 

 out of a fresh raw-egg shell, wet it and put it on your hand, 

 with the inside of the lining down on the hand. Press it 

 down and wait a few minutes What is it doing now? 



