Section 29. No Court shall question the va.lidity of any notifioation of of of tion issued under section `8,` se

29. No Court shall question the va.lidity of any notifioation of of of tion issued under section `8,` seetion 11, or section 12, on the on the ground that the provisions hereinbefore contained or anp am them hive not been complied with, or shall entertain in any ji0r.n mhatever the question whether they have been. coinplied Gith; but every such notification shall be conclusive proof that it has been issued -in accordance with law. . . . , . A , - . . tion of of of Courts tion issued under section `8,` seetion 11, or section 12, on the on the in,;;ggr- am