TY - JOUR T1 - Notes of Researches on the Poly-Ammonias.--No. XVIII. Tetrammonium-Compounds JF - Proceedings of the Royal Society of London (1854-1905) VL - 11 SP - 423 EP - 429 PY - 1860/01/01/ UR - http://dx.doi.org/10.1098/rspl.1860.0090 M3 - doi:10.1098/rspl.1860.0090 AU - Hofmann, A. ER -