[478] 24 Stat. 409.

[479] 35 Stat. 614; 38 Stat. 275.

[480] 29 Stat. 605.

[481] 192 U.S. 470 (1904).

[482] 223 U.S. 166 (1912); cf. United States v. California, 332 U.S. 19 (1947).

[483] 239 U.S. 325 (1915).

[484] Ibid. 329.

[485] 236 U.S. 216 (1915).

[486] Ibid. 222. See also Robert B. Cushman, National Police Power Under the Commerce Clause, 3 Selected Essays on Constitutional Law, 62-79.

[487] Groves v. Slaughter, 15 Pet. 449, 488-489 (1841).