62 
THE APPLE 
We must try to find out what causes this; so look for 
a spot on the apple which is not shiny and scrape 
it with your knife, taking care not to cut the skin. 
You should obtain a thin white shaving. This is 
Wax. 
Scrape the apple in other places, and you will find 
that it is coated all over with a thin layer of apple 
WAX. 
How can we prove that this is wax ? 
When grease or wax is put on paper, what hap- 
pens? Put a little apple wax on paper. It will 
have to be heated, but a candle or even a match 
will do. 
Does the apple wax mark the paper? 
If you drop wax or grease on water, what happens? 
Try this with the apple wax; does it behave the 
same way ? 
If you burn grease or wax, what happens? Take a 
little apple wax on a bit of wire or a hat pin and 
hold it in the flame of an alcohol lamp. If you 
have no lamp, a candle or even a match will 
show it. 
It is rather hard to perform this last experiment suc- 
cessfully because the little flame from the wax 
flashes so quickly. 
