Which preposition to use with concentre

in Occurrences 7%

* To come from his heroic character, all the amiable qualities of domestic life concentre in this tamed Bellerophon.

on Occurrences 2%

Flat upon the ground, the small army concentred on the igloo, and behind, deliciously expectant, crouched many women and children, come out to witness the murder.

Which preposition to use with  concentre