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Magnetic and X-ray measurements on crystalline melamine, C3X6H6, indicate that the molecular formula is of the amide type, based on the cyanuric ring, but that weak hydrogen bridges exist between the NH 2 groups of one molecule and the ring nitrogens of others, so that the substance may also tend to behave as an imide. The density is 1-571, the space group P 2Ja, and there are four molecules in the unit cell. An approximate structure is given. New optical data confirm that this structure is of a layer tj'pe, in wdiich respect it is similar to all other cyanuric ring compounds so far examined.