Parsis say breeding with non-Parsis is like a different species, will lower the morality of the race

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All it takes is one drop of poison

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From: Luhrmann, T.M. "The Good Parsi: The fate of a colonial elite in a postcolonial society". Harvard University Press, 1996

Pages 161

And the discourse about the mixing of the unmixable is angry. A lower-middle-class [Parsi] man asks pointedly: "Does a horse go with a camel? Does a dog go with a mouse? No." A remark from the floor at a lecture: "if you sow potatoes, you don't get cabbages. If we cross-breed, the intelligence may be there, but the morality always goes down."