BET] © Ss 
49, at the Alameda; camp 51, at Peralta, at the mill, and I shall 
establish two more, one at Taos, and the other at Secoro. 
These points are quite sufficient, and will be the base of your — 
‘operations; and upon them you will form a trigonometric canevas. 
For this purpose the rule requiring every angle of the series to be 
greater than 30°, may be wholly disregarded. And after having 
determined by triangulation the position of any three conspicuous 
peaks, the position of any other points, which are in view of the - 
_ three first named, may be determined by the problem of three points, _ 
as is practised in hydrographic surveys. Many such points will 
_ ‘present themselves. era: 
The canevas completed, the course of the Del Norte, that of its 
tributaries to the base of the mountains or beyond the settlements; 
the width of the valleys; the quantity of land under cultivation; 
the position of the towns, churches, hills, and all other topogra- 
phical features of the country, can be determined with the Schmal- 
kalde’s compasses. . 
If your force is sufficient, the operation described in this last — 
paragraph may be carried on simultaneously with the triangulation. 
3 ou are aware that I have no theodolite at my disposal, the trian- 
_ gulation must, therefore, be made with the sextant. _ 
cee fhe population, number of cattle, horses, and sheep, and the 
quantity of grain and other agricultural products, the facilities and 
best localities for water power to propel machinery, and also the 
mineral resources of the country, it is very desirable to know. 
i) 
ington. ' : 
culminating stars, and for the magnetic dip and declination. 
: The series for longitude will be continued for at least three luna-_ 
ions, and, should an opportunity present itself, I wish the observa- 
ions and results to be communicated to me in California. 
_ 4am, very respectfully, your obedient servant, 
C) 
3 
. 
Lieutenant J. W. Azerr, or, in his absence, 
K. 
. . 5 
First Lieut. Corps Top. Engineers. 
Lieutenant W. G. Pec : 
