Footnote
d The expression “Watch Tower” is not unique to Russell’s writings or to Jehovah’s Witnesses. George Storrs published a book in the 1850’s called The Watch Tower: Or, Man in Death; and the Hope for a Future Life. The name was also incorporated in the title of various religious periodicals. It stems from the idea of keeping on the watch for the outworking of God’s purposes.—Isa. 21:8, 11, 12; Ezek. 3:17; Hab. 2:1.