h of emigration and population. Many other
reasons might be urged to show that its prospective increase of
population will vastly exceed the ratio of its retrospective increase,
but these are sufficient.

FOOTNOTES:

[3] La Salle appears to have discovered the Bay of St. Bernard, and
formed a settlement on the western side of the Colorado, in 1685.--_See
J. Q. Adams's Correspondence with Don Onis. Pub. Doc. first session 15th
Congress, 1818._

[4] Baird.

[5] See Mr. Clay's Report on the Public Lands, April 26, 1832, U. S.
Papers.

CHAPTER III.

CLIMATE.

Comparative view of the Climate with the Atlantic States.
Diseases.--Means of preserving health.

_Climate, &c._ In a country of such vast extent, through 15 deg. of
latitude, the climate must necessarily be various. Louisiana,
Mississippi and the lower half of Arkansas, lie between the latitudes of
30 deg. and 35 deg., and correspond with Georgia and South Carolina. Their
difference of climate is not material. The northern half of Arkansas,
Tennessee and Kentucky, lie west from North Carolina and the southern
portion of Virginia. The climate varies from those states only as they
are less elevated than the mountainous parts of Virginia and Carolina.
Hence, the emigrant from the southern Atlantic states, unless he comes
from a mountainous region, will experience no great change of climate,
by emigrating to the Lower Mississippi Valley. Missouri, Illinois,
Indiana and Ohio, lie parallel with the northern half of Virginia,
Maryland, Delaware, Pennsylvania, New Jersey, and so much of New York
and New England as lies south of the 42 deg. of north latitude. But
several circumstances combine to produce variations in the climate.

1. Much of those Atlantic states are hilly, and in many parts
mountainous, some of which are 2 and 3000 feet above the level of the
ocean. The parallel western states have no mountains, and are not
proportionably hilly.

2. The Atlantic states border on the ocean on the east, and feel the
influence of the cold, damp winds from the northeast and east. Their
rains are more copious and their snows deeper. The northern portions of
the West, equally with New York and Vermont, are affected with the
influence of the lakes, though not to the same extent.

5. "The courses of rivers, by changing in some degree the direction of
the winds, exert an influence on the climate. In the Atlantic states,
from New England to North Carolina, the r