What kind of conjunction to introduce an adverbial clause

What is the “narrow cell” in line 15 of “elegy written in a country churchyard”

In 1896, a 308-page edition of  the american wheelmanearned the distinction of being "the largest magazine ever issued from a printing press,” according to the advertising journal  printers’ ink. which accurately describes this statement? it is subjective because the information contained in this statement cannot be proven. it is subjective because everyone would agree with the information contained in this statement. it is subjective because the information contained in this statement can not be proven. it is objective because the information contained in this statement can be proven. it is objective because not everyone would agree with the information contained in this statement.

In the poem, collins compares his love to a pigeon on a generals head