--The grammatical subject _it_ has no meaning till explained
by the noun clause.
7. It is believed that sleep is caused by a diminution in the supply of
blood to the brain.
8. The fact that mold, mildew, and yeast are plants is wonderful.
9. Napoleon turned his Simplon road aside in order that he might save a
tree mentioned by Caesar.
+Explanation+.--Unless _in order that_ is taken as a conjunction connecting
an adverb clause of purpose (see (7), Lesson 65), the clause introduced by
_that_ is a noun clause explanatory of _order_. [Footnote: A similar
explanation may be made of _on condition that, in case that_, introducing
adverb clauses expressing condition.]
10. Shakespeare's metaphor, "Night's candles are burnt out," is one of the
finest in literature.
11. The advice that St. Ambrose gave St. Augustine in regard to conformity
to local custom was in substance this: "When in Rome, do as the Romans
do."
12. This we know, that our future depends on our present.
The +noun clause+ may be used as +principal term+ of a +prepositional
phrase+.
13. Have birds any sense of why they sing?
birds | Have | sense
=======|================ they | sing
| \any \ -----|------
\ of | \why
\ / \
\-------------
+Explanation+.
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