3. Between flood-and ebb-tide there is a period of rest called slack-water.
4. The speeches were generally reported in Handels- und Machtpolitick (politics of trade and power).
In No. 3 “tide” is omitted from the first of two compound hyphenated words connected by a conjunction. In No. 4 the common ending (politick) is omitted from the first of two compound solid words, a hyphen taking its place.
We know of no author who deals with the somewhat inconsistent use of the hyphen in No. 4; but we believe such usage is to be recommended.
5. Truffles grow in calcareous soils, usually under birch-or oak-trees.
6. Mr. So-and-so asserted that the present-day practices are wrong.
7. The president of the society is a member of several committees ex officio; but the secretary is not an ex-officio member of any committee.
In No. 7 the first “ex officio” is formed of a preposition and a noun, and means by virtue of office. The second “ex-officio” is a compound adjective, as is “present-day” in No. 6.
Many writers prefer to put in italics all foreign expressions, such as “ex-officio.”