siana; N. W. to Forts Towson
and Gibson in the Indian Territory, and Smith in Arkansas; north to St.
Louis Arsenal at St. Louis, and to Newport barracks in Kentucky; but it
was spread over a larger surface east of the mountains. Its greatest
progress for the month, was a west and north-west progress.

In April, we find it had progressed rapidly west and north-west, and its
position is shown by the following cut and table.

[Illustration]

TABLE V.

------------------------------------------------------------------------
| JAN.|FEBR.| MAR.| APR.| MAY.|JUNE.|JULY.
------------------------------------------------------------------------
Fort Riley, Kansas. | 0.00| 0.94| 1.86| 4.55| 4.35| 1.10| 0.00
Fort Leavenworth, Kansas. | 0.04| 1.78| 1.33| 3.35| 5.55| 4.50| 0.18
Mean | 0.72| 1.01| 1.61| 2.74| 3.62| 5.80| 3.15
Alleghany Arsenal, Pittsburgh | 2.23| 2.33| 2.82| 4.21| 2.24| 2.06| 1.45
Mean | 2.18| 2.17| 2.70| 3.10| 3.58| 3.56| 2.97
Fort Columbus, New York Harbor| 2.60| 4.00| 0.70| 8.80| 7.70| 2.20| 1.90
Mean | 2.78| 2.92| 3.44| 3.33| 4.78| 3.46| 3.17
Fort Independence, Boston | 2.50| 3.36| 2.55| 5.40| 4.28| 2.00|
West Point. | 3.52| 5.04| 2.81|10.53| 2.00| 1.62|
Mean | 3.50| 3.44| 3.71| 4.55| 6.18| 4.79|
----------------------------------------------------------------------

We see, too, that both east and west of the mountains, its focus of
precipitation was one month in advance of the mean. At all the stations
where the greatest fall was in March, it should have been in April, and
the fall at those points was greatly in excess of the usual quantity. And
the same was true of stations reached in April. The concentrated trade,
instead of spreading out, and precipitating over the whole south-eastern
portion of the continent (its normal condition), was gathered into a wave
of greater volume, resulting in greater precipitation, and was rapidly
hastening its curve to the west over Texas, and to the north-west over the
Indian Territory, and northward on its usual curve to the north and east
of them.

The observations for April disclose another singular and instructive
condition. The temperature, that had every where been above the mean in
March, fell below it in April under the concentrated trade. And snow fell
on three days i