

The Spinner Family 
her house with its water floor. If her 
room needs a fresh supply of air she 
goes to the surface of the water, skil- 
fully catches a bubble of air by pro- 
truding a part of her body above the 
water and quickly drawing it beneath 
again, —just as you may carry bubbles 
of air to the bottom of a glass of 
water by quickly pushing a leaf down 
through the water. Having caught 
the bubble she carries it down to her 
diving bell and lets it go. She does 
this again and again till she has her 
room filled with pure air which will 
supply her lung-books with oxygen 
for many days. 
You must not imagine that the 
blood which carries the oxygen around 
through the Spinner’s body is red and 
warm like yours. Instead, it is cold 
and almost colorless, resembling milky 
water. It is known as white blood. 
It is forced around through the body 
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