304. Polyamines. Part III. The preparation of unsymmetrical amines of the types NHR·C<sub>2</sub>H<sub>4</sub>·NH·C<sub>2</sub>H<sub>4</sub>·NH<sub>2</sub>and NH<sub>2</sub>·C<sub>2</sub>H<sub>4</sub>·NH·C<sub>3</sub>H<sub>6</sub>·NH<sub>2</sub>, and the action of ammonia on di-p-toluenesulphonylbis-(β-chloroethyl)ethylenediamine