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We are talking about the number of people during an expedition. the author has made previous expeditions with porters and so on. In the next expedition, he is taking 35 people with him, but he is not sure of a safe trip. He has heard of about 200 people. And he says:
But in neither of the instances I had come to blows with natives, during the last trip, had I more than about the number above mentioned (between thirty and forty).