The mailing of a letter containing obscene or indecent matter is within the statute whether the letter is sealed or not, although the envelope may not have on it anything obscene.32 But although a letter may be sent through the mail for immoral or obscene purposes, yet such letter is not the basis of a criminal prosecution unless it actually contains obscene language.33

29 U. S. vs. Loring, 91 Fed., 881.

30 Durland vs. U. S., 161 U. S., 306;

Weeber vs. U. S., 62 Fed., 740.

31 Streep vs. U. S.f 160 U. S., 128.

32 U. S. Vs. Ling, 61 Fed., 1001;

Grimm vs. U. S., 156 U. S., 604.

33 U. S. vs. Lamkin, 73 Fed., 459.