its structure. It is formed by the action of nitrous acid on amino-guanidine, or, more exactly, by the interaction of an aminoguani-dinc salt with sodium nitrite in the absence of free mineral acid.
+ 3hao knh—nh—no l^3uanyl4-DltrotfoaroLnogaanyltctnizcne
Tetracene is a colorless or pale yellow, fluffy material which is practically insoluble in water, alcohol, ether, benzene, and carbon tetrachloride. It has an apparent density of only 0.45, but yields a pellet of density 1.05 when it is compressed under a pressure of 3000 pounds per square inch. Tetracene forms explosive salts, among which the perchlorate is especially interesting. It is soluble in strong hydrochloric acid; ether precipitates the hydrochloride from the solution, and this on treatment with sodium acetate or with ammonia gives tetracene again. With an excess of silver nitrate it yields the double salt, CaHrNjoOAg-AgNOa^H^O. Tetracene is only slightly hygroscopic. It is stable at ordinary nh2-c(nh)-nh-nh-n®n-c(nh)-nh-nh-n0
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