[168:1] The vicissitude of things.—Sterne: Sermon xvi. Gifford: Contemplation.

[168:2] A wise man is strong; yea, a man of knowledge increaseth strength.—Proverbs xxiv. 5.

Knowledge is more than equivalent to force.—Johnson: Rasselas, chap. xiii.

[168:3]

The bee enclosed and through the amber shown,

Seems buried in the juice which was his own.

Martial: book iv. 32, vi. 15 (Hay's translation).

I saw a flie within a beade

Of amber cleanly buried.

Herrick: On a Fly buried in Amber.