32 EXTRACTS FROM [PRELIMINARY] REPORT. 
of the line to the other; and, upon each section, an adequate supply of subsistence would 
doubtless be afforded from local productions. But there are other difficulties attending the 
absence of facilities for transportation, and of the innumerable conveniences of a numerous 
population, which can be remedied only by the completion of the railway. The expense of 
the operation would also be modified to conform to the method of its commencement and the 
manner in which it may be conducted. 
To begin simultaneously from the eastern and western limits, and proceed to a mutual junc- 
tion, would enable the road itself, in a great measure, to bear the burden of its own supplies. 
The grading, however, in order to hasten the completion of the work, would doubtless be carried 
on from New Mexico, and probably at the same time from various other points. 
Its successful and speedy completion, however, can be effected whenever the people of this 
country feel its importance to the union, dignity and prosperity of the United States, and are 
willing—in consideration of the national advantages to be derived—to give efficient national aid. 
I have the honor to be, sir, very respectfully, your obedient servant, 
A. W. WHIPPLE, 
: Lieut. Top. Engineers, in charge of Exploration. 
Hon. JEFFERSON Davis, 
Secretary of War. 
