GENERAL REPORT. 27 
1 i | 9.000 
Sere ee 
: he se 5624 
: 
i H j 
i23 4 5 67 ae rT eer anaes tae 15 
North, Vertical Seale 1 inch to 5000 feet. South. 
In the above profile, vertical proportions only are closely observed. 
The southward slope is well made out. TI have taken, so far as possible, 
representative altitudes. 
1. South Park, on Platte River, Colorado, altitude 9,000 feet. 2. 
Trout Creek Divide, 9,350 feet (approximate). 38. Granite on Arkansas 
River, 8,883 feet. 4. Puncho Pass, 8,945 feet. 5. Saguache, on the head 
of the Rio Grande, 7,723 feet. 6. Bacon Spring, near Fort Wingate, New 
Mexico, 7,189 feet. 7. Fort Wingate, 6,982 feet. 8. Zuni Mountains, rather 
a plateau than mountain-range, with an altitude of seldom, if ever, over 
9,000 feet. 9. Zuni, on the head of Zuni River, 6,355 feet. 10. Willow 
Spring, 7,195 feet. 11. Camp Apache, 5,000 feet. 12. Tanks south of 
Camp Apache, 5,624 feet. 18. Gila River, 18 miles east of San Ca4rlos, 
2,769 feet. 14. Camp Grant, 4,833 feet. 15. Tucson, 2,400 feet (approx- 
imate). 
Of course, as a rule, along any given latitude there would be an 
eastern or a western slope also, as this line is not far from the meridian 
of the continental axis. An absolutely north and south line would give 
somewhat different figures, but would nevertheless illustrate the same 
truth. 
Intimately connected with this slope of the continent to the south is 
the geographical distribution of the forest growth. It appears that the one 
factor of all others in the problem as to what shall be assigned as the lowest 
limit of timber, is the lowest point on the plain to which sufficient moisture 
