Recipe for B. B. Culture....????

Have any of you seen the following recipe anywhere, and can you tell me what it might be for? I'm thinking it's for keeping a sourdough bread starter alive, but wonder if perhaps my great-great grandma had a "recipe" such as the Baldwin sisters did on The Waltons. Or maybe it was for cough syrup? Anyway, if you've ever seen a recipe like this and know what it's for, please let me know.

B. B. Culture

1/3 cup raisins
2 Tablespoons sugar
2 Tablespoons molasses
1 quart water
1/2 cup culture

Give them 2 tablespoons of sugar every day for 10 days, then strain and bottle, wash culture and start again.

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