(c) Meteorological observations were recorded daily right across Brazil.
(d) Altitude observations, forming a complete chain and including all minor undulations, were registered across the entire South American continent from the Atlantic coast at Rio de Janeiro as far as Callao on the Pacific coast. The observations were taken with a hypsometer and several excellent aneroids. These show that many of the elevations marked on the existing maps of Brazil are inaccurate, the error amounting sometimes to several hundred feet.
(e) A complete survey was made of new country between the Araguaya river and the Madeira, including a careful survey of the Arinos river and the river Arinos-Juruena, one of the most powerful tributaries of the Amazon. In the small map, reproduced from the best existing maps, at the end of the first volume, several high mountain ranges, quite as high as the Andes, may be noticed extending from north to south between the rivers Madeira, Tapajoz, Xingu, Araguaya and Tocantins. Those high ranges are merely the work of imaginative cartographers, who have drawn them to make the map look pretty. They do not exist. I have left them in order to draw the attention of the reader to them. The position of the Arinos-Juruena is from 1 to 1½ degrees farther west than it is there drawn, and should be where I have marked the red line of my route.
(f) Everything that was of interest pictorially, geologically, botanically, or anthropologically was photographed or sketched. Astronomical observations were constantly taken to determine the positions of our camps and places of importance.
Botanical and geological collections were made, but unfortunately had to be abandoned.
(g) During the journey the head waters of the following important rivers were visited: The Rio Vermelho, Rio Claro, Rio Araguaya, Rio Barreiros, Rio das Mortes, Rio S. Lourenço, the Cuyaba river, the Xingu, the Paranatinga, the Paraguay river (Paraná), the Rio Arinos, the Secundury.
(h) The entire course of the river Tapajoz was studied, and also the entire course of the Amazon from its mouth almost to its birthplace in the Andes.
(i) Useful vocabularies were drawn up of the following Indian languages: Bororo, Apiacar, Mundurucu, Campas or Antis.
(k) The expedition has furthermore shown that it is possible with poor material in the way of followers to accomplish work of unusual difficulty.
(l) That it is possible for people in a normal condition of health to go at least sixteen days without food while doing hard work.