st a railroad failing to give prescribed
warning signals, Atlantic Coast Line R. Co. _v._ Ford, 287 U.S. 502
(1933); require use of locomotive headlights of a specified form and
power, Atlantic Coast Line R. Co. _v._ Georgia, 234 U.S. 280 (1914);
make railroads liable for damage caused by operation of their
locomotives, unless they make it appear that their agents exercised all
ordinary and reasonable care and diligence, Seaboard Air Line R. Co.
_v._ Watson, 287 U.S. 86 (1932); require sprinkling of streets between
tracks to lay the dust, Pacific Gas & Electric Co. _v._ Police Court,
251 U.S. 22 (1919).

_Sales in bulk:_ requirement of notice of bulk sale applicable only to
retail dealers. Lemieux _v._ Young, 211 U.S. 489 (1909).

_Secret societies:_ regulations applied only to one class of oath-bound
associations, having a membership of 20 or more persons, where the class
regulated has a tendency to make the secrecy of its purpose and
membership a cloak for conduct inimical to the personal rights of others
and to the public welfare. New York ex rel. Bryant _v._ Zimmerman, 278
U.S. 63 (1928).

_Securities:_ a prohibition on the sale of capital stock on margin or
for future delivery which is not applicable to other objects of
speculation, e.g., cotton, grain. Otis _v._ Parker, 187 U.S. 606 (1903).

_Syndicalism:_ a criminal syndicalism statute does not deny equal
protection in penalizing those who advocate a resort to violent and
unlawful methods as a means of changing industrial and political
conditions while not penalizing those who advocate resort to such
methods for maintaining such conditions. Whitney _v._ California, 274
U.S. 357 (1927).

_Telegraph companies:_ a statute prohibiting stipulation against
liability for negligence in the delivery of interstate message, which
did not forbid express companies and other common carriers to limit
their liability by contract. Western Union Teleg. Co. _v._ Commercial
Milling Co., 218 U.S. 406 (1910).

[1105] Hartford Steam Boiler Inspection & Ins. Co. _v._ Harrison, 301
U.S. 459 (1937).

[1106] Smith _v._ Cahoon, 283 U.S. 553 (1931).

[1107] Mayflower Farms _v._ Ten Eyck, 297 U.S. 266 (1936).

[1108] Buck _v._ Bell, 274 U.S. 200 (1927).

[1109] Skinner _v._ Oklahoma, 316 U.S. 535 (1942).

[1110] Yick Wo _v._ Hopkins, 118 U.S. 356 (1886).

[1111] Fisher _v._ St. Louis, 194 U.S. 361 (1904).

[1112] Gorieb _v._ Fox, 274 U.S. 603 (1927).

[1113] Wilson _v._ Eure