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Wilson in California; and it has been so successful that they are attempting a much bigger one still, 100 inches wide, or 8 feet 4 inches. If they succeed in making it, they will have the first telescope to surpass in size that of Lord Rosse. In this case, besides the great difficulties of making the telescopes, An accident to the traffic up Mount Wilson. they had the extra ones of getting them to the top of a mountain 6000 feet high, which are by no means inconsiderable. When I first visited Mount Wilson in 1904, the path up the mountain was only three feet wide, with a steep face on one side and a sudden drop on the other; the path was just about wide enough for one mule; but the mules did not think so; they kept trying to crowd past one another,