From the opinion rendered in the Ex parte Jackson and other cases, it would appear that the States are without the power to conduct postal operations over post-roads in competition or conflict with the United States, but that they may permit or themselves provide for, the carrying of letters or merchandise in other ways, as, for instance, by express companies, and this too, with reference to material excluded by Congress from the mails as immoral, fraudulent, or otherwise objectionable, except, of course, the distribution of matter treasonable to the United States or inciting resistance to its laws may not be authorized, nor may interstate commerce be regulated.

32 8 Cushing, Opinions of Atty.-Gen., 489.

33 Cf. Cong. Record, 53d Cong. 2d Sess., Appendix, Pt. I, p. 3 et seq.