3. Axtitude of the Principal Points above the Sea-level. 
(N.B. — Reduced on the Low Level of the River.) 
Name of the Points. 
Town of Serpa, on the Amazon 
Mouth of the Madeira 
Manicore on the Lower Madeira . • 
Baetas ,, „ 
Tres Casas ,, „ 
Ilha do Salomao ,, 
Domingo Leigue ,, 
Mouth of the Jammary ,, 
Eapid of Santo Antonio (below the break) 
Pall of Theotonio ,, 
Eapid of Morrinhos „ 
Caldeirao do Inferno „ 
Pall of Girao ,, 
Mouth of the Beni . . . 
Pall of Bananeiras (below the break) 
Eapid of Guajara Merim ,, 
Mouth of the Mamore 
Level of the Mamore at Exaltaoion . 
Altitude above Sea-level in English Feet. 
59 
69 
92 
131 
164 
174 
177 
184 
200 
272 
288 
305 
335 
402 
450 
475 
493 
499 
Diffekence of Level and Extent 
OF THE PbINOIPAL PalLS AND EaPIDS. 
Name of the Eapid. 
Difference of Level. 
Length of the Rap 
Engliish Feet. 
Y ards. 
Santo Antonio 
3-93 
300 
Theotonio (principal break) 
26-25 
110—300 
Caldeirao do Inferno 
4 
440 
Girao ..... 
26-25 
770 
Paredao ..... 
3-5 
600 
Pederneira .... 
3-31 
280 
Araras ..... 
3-41 
770 
Eibeirao (principal break) . 
13-15 
440 
Madeira ..... 
6-72 
980 
Lages ..... 
6-72 
820 
Pao Grande .... 
6-56 
440 
Bananeiras (principal break) 
19-7 
550 
Guajara Giiassii 
3-5 
500 
The slope represented ■ by eighteen larger and twenty-eight smaller rapids* is 
227|^ feet in an extent of 12J miles. The total difference of level between Santo 
Antonio and Guajara being 272 feet, 272 ft.— 2274 ft. =44^- feet ; which yields the slope 
of the smooths between the rapids. 
* The hoatmen on the Madeira usually distinguish a Rapid hy cahe<:a, corpo, e rabo ■ that is 
body, and tail. ' ’ 
head. 
) 
I 
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4 
