6 BOTANY. 
Sxctron VI. Valley of Zuii.—In this region, we would embrace the scope of country between 
the summit of the Sierra Madre, or mountains bordering the Rio Grande valley on the west, 
and Mount San Francisco; the principal and pervading stream of which is the Colorado Chi- 
quito, a tributary of the Colorado Grande, or, as it is more aptly termed, the great Colorado of 
the West. The general course of this valley is northwest and southeast ; the extent of which 
(in our rapid exploration) we were unable to determine. Its width, travelled, is about two 
hundred and fifty miles. : 
At Zuni, the Indians of the Pueblo tribes raise corn, and many other vegetables, without 
resorting to irrigation; but from the appearance of the soil on the bottoms of the Colorado 
Chiquito, it was considered by most of our party that irrigation might be necessary. In the 
immediate vicinity of the mountains there is evidence of an amount of moisture in the soil, 
which is wanting in the centre of the valley, more remote from their influence. The water of the 
Colorado Chiquito is sufficient to irrigate a portion of the central part of the valley, but probably 
not enough to make all the tillable lands available for agricultural purposes. There are many 
beautiful streams of water of limited extent, on both ranges of the mountains, which look into 
this valley from the east and the west. These streams would be sufficient for small settlements 
in their immediate neighborhood ; but on descending into an almost unlimited arid plain, they 
are lost by the absorptive power of the soil, and the rapid evaporation caused by the dry 
atmosphere. The Rio Mimbres, in the valley of which is situated Fort Webster, southeast of 
the Mogoyon, (which has been made well known by the operations of the Mexican Boundary 
Commission) is a good example of these facts. Such is the case, also, with nearly all the mount- 
ain streams in these arid regions. 
Grass throughout this whole country is very abundant, and of a most excellent quality, 
especially around the mountain bases, and on the more elevated plateaus. Large herds of 
cattle and sheep might be reared and sustained here, were it not for the depredations of the 
Indians. We were told by Mr. Leroux, that the wild Indians of this country, in their blind 
eargerness to obtain the flesh of mules, have been known to shoot one down with their arrows 
while a traveller was yet seated on his back, for which, in a case that he mentioned, the poor 
savage paid the penalty of his life. 
Unfortunately, we passed this region between the 18th of November (when we crossed the 
crest of the Sierra Madre) and the 25th of December. At the latter date, we encamped at the 
base of the San Francisco mountain. This was the most unpropitious season of the whole year 
for the collection of herbaceous plants, and must account for the meagreness of my collections 
in this part of our journey. 
The entire eastern, southern, and part of the western, angles of this region, are well timbered 
with Douglas’s spruce, New Mexican yellow pine, pifion, and balsam fir. -The Rocky mount- 
ain white pine (Pinus flexilis) grows on the San Francisco mountain, and no doubt on the 
higher peaks and ranges of the Sierra Madre and Mogoyon. Oaks and black walnut also grow 
‘here. The banks of all the streams that are crossed produced cotton-wood and mezquite—in 
some places in great abundance. Three kinds of cedar abound at the base of the mountains, 
frequently extending (in more limited quantities) down to the banks of the Colorado Chiquito, 
wherever the evenness of the surface appears to be broken by dry arroyos or broken banks. 
On the slopes east and south of San Francisco mountain, looking into this valley, and also 
westwardly, are vast forests of pijion, intermingled with cedars, perfectly black in the distance, 
by their density. From elevated points near the southern base of Bill Williams’ mountain we 
had extensive and beautiful views of these forests, which extended southwestwardly, apparently 
some fifteen or twenty miles. This one we denominated the ‘‘ Black Forest.’”’ With the aid 
of the telescope, we could detect (January 3d, side reconnoissance) the eamp-fires of the Tonto 
Indians, in several places, in the forest. We were informed by our guide, Mr. Antonio Leroux, 
who has had much experience, and even desperate forays, with the Indians of this neigh- 
_ bérhood, that, at the proper season of the ycar, large parties of the Yampai, Tonto, Coyotero, 
