1524 Hulme The Crystal and 287. The Crystal and Molecular Structure of Chloro( trimethyl) -p yridinetin(1v). By R. HULME. By X-ray diffraction methods the compound (C5H,N)Me,SnCl is shown to be monomeric and covalent. The trigonal bipyramidal molecules contain a five co-ordinate tin atom the Sn-C1 distance being 2