10 
HARRINGTON. 
Station. 
Elevation. 
Rainfall. 
Cubilguitz. 
Feet. 
984 
2,395 
2,789 
3,248 
4,100 
4,285 
Inches . 
167 
202 
222 
170 
150 
98 
Setal... 
Chiacam... 
Senahu. 
Panzamala. 
Chimax... 
In this case we have a maximum at about 2,500 feet of 
elevation—the decrease below due perhaps to sheltering 
mountains to the north. These winds, as was to be ex¬ 
pected, are of very considerable depth or force and carry 
rain up to heights of 4,000 or 5,000 feet. 
On the east coast the stations are at sealevel, and we have 
no opportunity to test the effect of elevation except at Colon 
and Gamboa. In the investigations for the Nicaragua canal, 
however, observations were taken in the San Juan valley by 
the engineers from April to September, 1851. Reducing 
these by means of Rivas to the later years, and then expand¬ 
ing by comparison of the months with those at Greytown, 
we get an annual rainfall of about 120 inches. The region 
occupied by the surveying party was well down the San 
Juan river, at a height certainly less than 100 feet (Lake 
Nicaragua, 130 feet). From this it appears that the trade 
which brings such enormous rains at Greytown is lessened 
in effect by a half or more in an ascent of less than 100 feet. 
Facts of the same character appear at Colon and Gamboa. 
The latter is on the watershed, and the instrument was 102 
feet above sealevel. The rainfall at the former is a third 
larger than at the latter. If we consider that only a part of 
this rain is of trade origin, and that, as is to be shown, the 
invierno is little affected at elevations below 3,000 or 4,000 feet, 
we may conclude that the rain bearing stratum of the trades 
here is very shallow, and that most of its rain is dropped at 
elevations less than 500 feet. 
