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Longitude W. from Paris.

Names of Places. N. Latitude. Names of observers and
In degrees. In time. remarks.

Arispe, (city) - - - 30° 36 o"l 11° 18'30" 7h 25' 14" Mascaro and Rivera.
Presidio de Janos - - . . . . . . .109 5 30 7 16 22 Mascaro.
Presidio del Altar e 31 2 O 14 6 O 7 36 24 Mascaro and Rivera.
Passo del Norte, (Presidio 32 9 O 107 3 o 7 8 12 Mascaro.
Junction of the Rio Gila and Colorado 32 45 o . . . . . . . . . . . . Fathers Diaz and Font.
Las Casas grandes (near Rio Gila) 33 30 0 . . . . . . . . . . . . Father Font.
Santa Fe, (city) - 36 12 O 107 13 O 7 8 52 Lafora.

- TABLE Of the most remarkable elevations measured in the interior of New Spain.

The work published with the title of Nivellement barometrique fait dans les Regions Equinoziales du Nouveau Continent, in 1799–1804, contains more than two hundred points in the interior of New Spain, of which I determined the elevation above the level of the sea, either by the barometer, or by trigonometrical methods. We have merely inserted in the following table the absolute heights of the most remarkable mountains and cities. The points marked with an asterisk are doubtful. My Recueil d'observations astronomiques et de mesures barometriques edited by M. Oltmanns may also be consulted, (vol. I. pages 318 to 334.)

- Height above the level of the sea,
- according to the formula of M.
Names of places of observation. Laplace.
In metres. in toises. |. Eng. feet.*
Volcan de Popocatepetl, volcan grande de Mexico o de Puebla - 54OO 2771 17710
Pic d'Orizaba or Citlaltepetl - - - 5295 2717 17371

Nevado d'Iztaccihuatl, Sierra Nevada of Mexico - -
Nevado de Toluca, at the rock of Frailes - - - - -
Coffre de Perote or Nauhcampatepetl - - -
Cerro de Axusco, six leagues to the S.S.W. of Mexico

4786 2456 15700
4621 2372 15159
4089 2098 13514
3674* | 1885* 12052

*This column is added by the translator.

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Height above the level of the sea, according to the formula of M.

Names of places of observation. Laplace.
In metres. In toises. In Eng. feet.
Pazcuaro, city - - - - - - 22O2 1130 T/224
Charo, city - - - - - - - - 1907 978 6256
Villa de Islahuaca, in the intendancy of Walladolid - - 2585 1326 8481
San Juan del Rio, town - - - - - - 1978 101.5 6489
Queretaro, city - - - - - - - 1940 005 6364
Celaya, city - - - - - - - 1835 941 6020
Salamanca, city - - - - - - - 1757 902 5763
Guanaxuato, city - - - - - - 2084 1069 6836
Mine de la Valenciana - - - - - - 2328 1194 7637
Durango, city - 2 - - - - - 2087% 1071 6847

END OF GEOGRAPHICAL INTRODUCTION.

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