amasser

À cette époque, on n’avait d’autre moyen de détruire le mauvais gaz qu’en le décomposant par de petites explosions, avant que sa légèreté l’eût amassé en trop grandes quantités dans les hauteurs des galeries.
At that time there was no other means of destroying the bad gas but by dispersing it in little explosions, before its buoyancy had collected it in too great quantities in the heights of the galleries.
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