Claim: At the Khone Falls, the men realized that the river was not at all navigable for any merchandise transport vessel and the steamboats had to be left behind; still, the mission never spent a week studying the falls, hoping to find a point where a large-sized river boat might be able to pass the cataracts.
Evidence: Still, the mission spent a week studying the falls, hoping to find a point where an average-sized river boat might be able to pass the cataracts or otherwise, whether the establishment of a lateral channel would be feasible.