Always to be regarded as parenthetic and to be enclosed between commas (or, at the end of the sentence, between comma and period) are the following: (1) the year, when forming part of a date, and the day of the month, when following the day of the week: February to July, 1916. April 6, 1917. Monday, November 11, 1918. (2) the abbreviations etc. and jr. (3) non-restrictive relative clauses, that is, those which do not serve to identify or define the antecedent noun, and similar clauses introduced by conjunctions indicating time or place. The audience, which had at first been indifferent,
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