The general welfare of the American people demands the open shop principle in our industries. Speaker, v. 2, p. 398: Report of speeches.—C. L. of P. Debates: References.

In labor disputes workmen are justified in demanding as a condition of settlement that their employers agree to employ only members of trade unions. Pearson, p. 261: Speeches and references.

The movement of organized labor for the closed shop should receive the support of public opinion. Debaters' handbook ser., no. 16: Briefs, references and selected articles.—Wisconsin University, no. 395: Arguments and references.

Opium habit. See [Drink and opium.]

Opium trade.

Suppression of the opium trade in the East. Askew, 1906, p. 163: Briefs and references.—Askew, 1911, p. 166: Briefs.

Opportunities for success. See [Success.]

Optimism and pessimism.

Is the world growing better? Gibson, p. 242: Briefs and references.

Is there more ground for the philosophy of optimism than for the philosophy of pessimism? Matson, p. 443: Briefs and references.