ss 
CHAP. IV. 
Proceeding of the Commission of Surveij at the Isthmus. — Measurement 
of a base line on the beach between St. Mateo and Santa Maria. — 
Examination of the district of Tehuantepec. — Las Ventozas and near 
the Morro unfit for anchorages. — Trigonometrical observations at San 
Dionisio, Camotepec, Juchitan. — Examination of the tipper and loiver 
Lagoons — The Boca Barra. — The River Ostuta. — Its waters to feed 
the Proposed Canal. — The ground north of theChivela, Guiehicovi, 
Boca de Monte. — First view of the Coatzacoalcos at Mai Paso, its 
Transparency, firm clay banks, slow current, its borders lined 
ivith thick woods. — Excursion down its Course to its Mouth, — 
Weather then unfavourable for Observations. — Visit to Acayucam, 
— The Jumuapa. — Return to Tarifa. — Venta de Chicapa. — Ground 
examined from San Miguel to the Rio del Corte (the uj)per Coat- 
zacoalcos. — Cerro de Albricias, the view from this fixes the choice 
for the passage of the Canal over the Gap of Tarifa. — Its minute des- 
cription. — Departure of Captains Robles and Gonzalez to survey 
the Coatzacoalcos. — The River Chicapa. — Tarifa and the Ultimo 
Rancho have the same level, — Volume of the waters of the Chicapa 
below its junction with the Monetza. — Cerro del Convento, — Source 
of the Monetza and the river at Tarifa, same level ; also the Por- 
tillo. — The Ostuta examined and practicability of joining its waters 
by a Conduit to those of the Chicapa. — Captain Robles comjiletes 
the Survey of the lower Coatzacoalcos, and examines its upper waters 
down to the Sarabia. — Sr. Moro explores the ground from Tarifa 
to the confluence of the Malatengo ivith the Coatzacoalcos; — also from 
Tarifa to the Rio del Corte. — Re-inspection of the proposed line of 
conduits for the waters of the Ostuta and Chicapa to Tarifa by 
Messrs. Moro and Robles, and their confirmation of its liracticabi- 
lity — Final Return of the Commission to Tehuantepec the explora- 
tion of the Isthmus being completed. 
The Commission arrived at Tehuantepec on the 28th. May, 
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