Which preposition to use with merkur

during Occurrences 1%

Moreover, men of worth quickly gathered about him, and this alliance of preëminent litterateurs was so active that the Merkur during a period of several years may be employed as a textbook of our literary history.

for Occurrences 1%

The quality which maintained the value and the dignity of the Deutscher Merkur for many years was its editor's innate liberality.

Which preposition to use with  merkur