362 O. C. Marsh on Ledererite from Nova Scotia. 
of the plateau, of the mountains, and of the great rivers. This 
column of progress advances from south to north ; it has reached 
and permanently occupies the southern half of the San Luis park. 
t the same moment the column of the American people ad- 
vancing in force across the middle belt of the continent, from 
east to west; is solidly lodged upon the eastern flank of the Cor- 
dillera, and is everywhere entering the parks through the passes. 
These two American populations, all of the Christian faith, here 
meet front to front, harmonize, intermarry, and reinvigorate the 
lended mass with the peculiar domestic accomplishments of 
each other. 
The Mexican contributes his primitive skill, inherited for cen- 
turies without change, in the manipulations of pastoral and 
mining industry, and in the tillage of the soil by artificial irr 
gation. The American adds to these machinery and the intel- 
ligence of expansive progress. The grafted stock has the sa 
of both. As the coming continental railroad hastens to bin 
together our people isolated on the seas, a longitudinal railroad 
of 2,000 miles will unite with this in its middle course, bisecting 
the Territory, States and cities of 10,000,000 of affiliated people. 
This will fuse and harmonize the isolated peoples of our contl- 
nent into one people, in all the relations of commerce, aflinity 
and concord. 
San Louis di Calebra, July 5, 1866. 
Art. XXXVIII—Contributions to the Mineralogy of Nova 
Scotia ; by Prof. O. C. Marsu, of Yale College —No. 1. 
Ledererite identical with Gmelinite. 
During their first geological excursion to Nova Scotia, 12 
1827, Dr, C. T. J 
covered a mineral at Cape Blomidon which has since been the 
subject of no little discussion among mineralogists.* _ bags 
authors ap tly regarded it from the first as a new species, bu 
other authorities differed widely as to its true nature. Mr. 
Brooke of London, after measuring the angles of a crystal, ie 
nounced it to be apatite, a view subsequently controverted | rd 
M. Dufrénoy of Paris, while Dr. Torrey of New York cons! 
ered it nepheline 
+ This Journal, 
= 7D. 78. 
BS 3! ike 
Some ee 
