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Combine milk and chocolate in a medium size heavy saucepan;.
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cook over low heat until chocolate is melted.
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Add sugar, corn syrup and salt,.
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cook, stirring constantly, to boiling.
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Cook, without stirring to 234 degrees F. on a candy thermometer. (A teaspoon of syrup will form a soft ball when dropped into cold water).
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Remove from heat at once.
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Add vanilla and butter but do NOT stir in .
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Cool mixture in pan to 110 degrees F., or until lukewarm.
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Beat with wooden spoon until mixture thickens and begins to lose its gloss. (This will take about 15 minutes.).
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Spread in a buttered 8-inch x 8 inch x 2 inch pan.
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Let stand until set and cool.
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Cut into squares.