Wash cucumbers and chill in ice water.
Sterilize jars, tongs, a cup and a funnel.
Bring water, alum, vinegar and salt to a boil.
Reduce heat and keep liquid simmering.
Drain and dry cucumbers.
Put a sprig of dill and a clove of garlic in each quart jar.
Pack jars with cucumbers.
Fill with hot vinegar solution; seal.