105 
DE YEETEUIL — PGRT-GF-SPAIET. 
minima, 57 to 58 ; average number of rainy days, 200 ; 
maximum, 208 ; minimum, 157 ; mean monthly quantity, 
from January to June, 3* 10 inches ; from June to January, 
8*60. Humidity, 0-797 to 0*800 ; during the driest months, 
viz. : January, February, March, April and May, the ten- 
sion of the vapour is 0*723, and as low as 0.677 and 0-625 
in April and May ; it is 0'807 during the wet months, and 
as high as 0*827 in July and August. 
The wind may be said to prevail, during seven months, 
from E. to S.E. ; during three months and-a-half, from N. 
to N.E. ; and during only a month and-a-half, from W. to 
S-.S.W. ; almost never from N.W. 
Only 6*57 of the whole surface of the Island is under cul- 
tivation, the remaining 93-43 being still covered with copso 
wood and virgin forests. 
Trinidad is traversed from E. to W. by three ranges. The 
Northern range which is parallel and adjacent to the Coast, 
stretches out westwards for about 10 miles, forming with 
the western side of the mainland nearly a right angle. 
The average elevation of that portion is from 1500 to 2000 
feet. Two spurs running out southwards encircle an irre- 
gularly-shaped plain, from 1 to 2 miles broad, and about 
3-41 miles along the sea shore. The area of that plain may 
be calculated at about 2500 acres. It has towards the sea 
a gentle slope of about 60 feet per mile, and is traversed 
on the E. by the St. Ann ravine, or “Dry River;” and 
about its centre, by the Mucurapo river which drains the 
valley of Maraval. There are along the sea shore, espe- 
cially at the mouth of the Mucurapo, several small swamps. 
In fact, a narrow belt of the coast, from the eastern to the 
western spur is very low and more or less marshy. 
The river Caroni has its mouth about 2 miles southwards 
