The return visit to Cerro de la Neblina in southwesternmost Venezuela, anÂnounced in the introduction of Part III of our Guayana Highland reports, was indeed accomplished as there indicated. We returned to New York on 11 February 1958, having completed a six-month exploration of Neblina and waterways of the Rio Orinoco-Rio Casiquiare-Rio Negro drainages. During the succeeding March, Venezuela was again visited, so that we might make further aerial survey of the mountain and the region around it.
