66 



LOWER EIO BRAVO. 



^ w 



of tlie river changed, the right of navigation through the new channel should remain unimpaired 

 to Loth countries^ but the jurisdiction of the land must remain as we had arranged. 



Five miles above Roraa^ and opposite Mier^ there is a large island called Los Adjuntas, which 

 w^as awarded to the Mexican side. At present the channel is bet^veen the island and the Amer- 



•J 



lean shore. Formerly the channel was very nearly equally divided on either side of the island^ 



)ccupation of Mier by the American troops a temporary causeway was con- 



but 



loose 



of grazing. This causeway^ i 

 channel which rules the islan 

 on the Mexican side are tepid 

 diseases. The springs which 



permanent 



At 



m 



latural baths are near them^ and are supposed to 

 They were supposed to be sulphur springs, but 



hydrogen.* 



hich I placed in the hands of Dr. Easter detected 

 )gical character of the rocks from Reynosa. wher 



first noticed, up to Las Moras, a distance measur 



mileSj is much the same, while they differ in their lithological character. If any difference is 

 to be noted in the zoological character of these rocks it is in the exposure, just above Roma, at 

 the foot of the island of Las Adjuntas, and at several other localities in the neighborhood^ of 

 banks of fossil oyster-shells of great size, some of them measuring 18 inches in length. 



I have noted at Roma the occurrence of sandstone studded with nodules of ferruginous iron. 

 Throughout the section between the San Juan river and Loredo, septaria and strata of yellowish 

 and green sandstone frec^uently cocur. Often the nodules of more durable substance project 

 beyond the weather-w^orn surface of the softer sandstone, producing picturesque appearances. 



The town of Mier, famed in the history of the war of independence of Texas, stands upon the 

 Alamo river, four miles back from the Rio Grande, contains about ^00 inhabitants, and is now 

 cliiefly noted for the superior quality of the blanket manufactured there. It was an important 



5 point where the road to Monterey diverges from 



the invading army were transferred from water 



to land transportation. From Mier upwards, the course of the river is more nearly north and 



south, and less winding in its course. The hanks on either side become more abrunt and rocky, 



point during the war with Mexico, being th 

 the Rio Bravo, and where the supplies for 



the first time in ascending we find a rocky bottom. 



-six miles above Eoma, measured by the river, is Bellville, the trading establishment 



hospitable and enterprising gentleman who has built himself a warehouse 



old 



O 



ornament 



^Tlxe foUowing is the result of the quantitative analyses by John D. Easter. The whole quantity of sol 

 0.6763 per cent., consisting of — 



Silica _ _ 0.016586 per cent. 



Botoreide iron _ _ __ __ 0.000754 



Alumina.. traces, 



lime _ __ __ _ 0.009389 



Magnesia 0.009580 



Sodium _ _ 0.243323 



Chlorine _._ O.340470 



Sulphuric acid ^ 0.010180 



Phosphoric acid _^ traces. 



Iodine acid ^ traces. 



a 



n 



C( 



(I 



(( 



a 



0.6302S2 



