CHAP. IV. 
Proceeding of the Commission of Survey 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 upper and lower 
Lagoons—The Boca Barra.—The River Ostuta.—Its waters to feed 
the Proposed Canal.—The ground north of the Chivela, Guichicovi, 
Boca de Monte.—First view of the Coatzacoalcos at Mai Paso, its 
Transparency, firm clay banks, slow current, its borders lined 
with 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 upper 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 completes 
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 with 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 practicabi¬ 
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, 
c 
