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Preheat oven to oven to 375*.Sift together the flour, baking powder, and salt. In a large mixer bowl, beat the eggs at high speed until lemon colored.
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gradually add the sugar a tblespoon at a time, beating constantly; add the vanilla.
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Reduce speed to slow and add the flour mixture to the egg mixture, beating only until blended.
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add the hot water all at once and beat to a smooth batter.
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Line a 15x10" jelly roll pan with wax paper and grease.
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Spread the batter evenly over the pan. Bake for 12-14 minutes or until the cake is golden and springs back when you touch it lightly with your finger.
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Loosen the cake carefuly from the sides of the pan with spatula. Sift powdered sugar over the cake, cover with a dish towel. Peel off the wax paper and quickly trim off the crisp edges with a sharp knife.
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Beginning at short end, roll the cake and towel together into a firm roll.
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cool on a rack while you prepare the filling.
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in a mixer bowl, beat the cream cheese with the milk until smooth -- and fluffy.set aside.
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in a saucepan, combine the sugar, cornstarch, lemon rind, and salt.
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place a strainer over the pan and drain the juice from the blueberries into the mixture, setting the berries aside.
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cook over medium heat until thick, stirring constantly.
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Remove from the heat and stir in the butter, lemon juice and mace.
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Carefully fold in the blueberries.chill.
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carefully unroll the cake and spread the cream cheese mixture thinly over the entire surface.
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Spread the blueberry mixture over the cream cheese to within 1/2" of the edges, and reroll the cake.
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place the roll, seam side down on a rectangular tray and refrigerate until 30 minutes before serving.
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cut into 1" slices and serve.