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Why is glass of window panes of very old...

Why is glass of window panes of very old builidings found to be thicker at the bottom than as the top and why is it milky ?

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Glass is an amorphous solid which is a supercooled liquid of high viscosity and hence possesses fluidity. Due to this property it is thicker at the bottom than at the top. Milkiness of glass is due to the fact that it undergoes heating during the day and cooling at night, i.e., annealing over a number of years. As a result, it acquires some crystalline character.
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