98 



SKETCH OF TERRITORY ACQUIRED BY TREATY. 



the foot of the Carrizalillo hills, there is a gentle ascent of the prairie. In the prolongation of 

 the line towards this last named Sierra, it passes six miles south of the '' Sierra del Tabaco," and • 

 north of, but very near, two small isolated hills, where the magnetic needle underwent a varia- 

 tion of 2° 30' ; the needle was affected by this magnetic influence at the distance of three miles, 

 on each side of these hills. The mountains on the left of the flag in this view, are the Sierra 

 de la Boca Grande ; those directly on the back-ground, the Sierra del Carrizalillo, where the line 

 crosses ; and those on the right hand belong to the Sierra del Tabaco. 



No. 7 



It leads 



marked bv a monument 



up a steep valley across these hills, through an open valley, into another series of hills, where 

 the parallel 31° AT terminates. This termination is 

 is given in sketch Xo. 8. 



Sketch No. 8.— From this point southward the meridians connecting the parallels 31 

 and 31° 20' constitute the boundary line. This sketch gives a view 

 point of line on parallel 31° 47', and not along the line. 



Sketch No. 9 represents a view of the line, on the meridian, from 



o 



47 



terminal 



terminal point on parallel 31° 47'. 



No 



The flag marks the direction across the hills. 



- - . This view is 



south along the meridian. The high mountains on the left are the Sierra de la Boca Grande. The 

 distant hill ranges beyond the plain, and covered by the flag are the hills on which is erected 

 the monument marking the beginning of the boundary on parallel 31^ 20'. The hills on the 

 right hand belong to those adjoining - Ojo del Perro." The boundary line here runs through 

 a large valley or plain ; the Sierra de la Boca Grande lying on the east, and the Sierra de la Hacha, 

 and that of Ojo del Perro, on the west. Nearly in the middle of this valley, and about 172 miles 

 east of the boundary line, are situated the Ojos de los Mosquitos, five in number, which, though 

 furnishmg an abundant supply of clear water, soon sink below the surface. The pasturage 



generally sandy, and many spots are 



destitute of vegetation. 

 bushes abound. 



of tliis valley is good in some places ; but the soil 



As the mountains are approached, the soil becomes gravelly and 



^ Sketch No. 11 presents a view of the hills on which is located the monument marking the 

 initial pomt of the line on parallel 31° 20'. The view looks south along the meridian, and 

 the tiag marks the spot where the monument is erected. 



Sketch 



merid 



The 



rocky bluffs on the left are a part of the mountains near Ojo del Perro. Further on, and in 



Hach 



hill ranges on which terminates the line on parallel 31° 47'. . 



Sketch No. 13 is taken from the same . point as No. 12, but looks west along the parallel 31° 

 20 . All the hills here represented belong to the Sierra del Ojo del Perro. The spring giving 



mountain 



o 



IS about seven miles west of the monument, and north of the flag one and I half 



.» . 1 ^Zl^ '' ' "'T *'''''° ^""^ **""= ^^''' "^"'^'"^ ^y *« fl^S !° sketch No. 13, looking 

 eastward. The range behind the flag embraces the hill on which is located the monument, as 



t;°r t ?° ;• '"»™*-" ---S^ -the back-ground ou tho left is Sierra d; la 



J3oca Urande. From this flflo- xvocf^nvri +i.^ t.^,,«.i.^.. i- ' 



miles 



rAiin;i*i.;n« Jr. . "^ -^i^o xKjx ct itjvv mues over a series oi 



M V L r ; . , ""T^ " "'''^ ™"'^' ''''^'' *'" '^'S'' «'"™ ^<^ San Luis. The soil of 

 th,s valley rs l.ght and sandy, except in the middle it is covered with grass and other vegetation. 



