40 WARREN D. SMITH 
more detailed description of this country, the reader is referred to 
Vol. IV, sec. A, No. 1, p. 19 of The Philippine Journal of Science; 
“Contributions to the Physiography of the Philippine Islands,” 
IV, W. D. Smith. 
We have, more or less, general notes on the population of this 
region but our main source of information comes from Reed who 
wrote quite extensively on the Negritos of Zambales. These 
people are pretty much the same as the Negritos of other parts of 
the Island, and make up a very much scattered and nomadic tribe. 
The principal pass across this region is from O’Donnell in the 
Central Plain, to Iba. The government has built a road, within 
recent years, between these points. 
There is another well-defined trail from Mangatarem across to 
Infanta at the southern end of Dasol Bay. 
There is also a good road from Alaminos to San Isidro, and in 
the southern part there is a telegraph line from Olongapo to 
Dinalupijan. With the exceptions of the use by the natives and 
occasional expeditions of U.S. Marines, this trail is very little used. 
The northern Zambales are not covered with a particularly 
heavy growth of timber; in fact, many parts, like Pinatubo are 
quite bare up to about 5,000 feet—the last 1,000 feet being covered 
with a dense mossy forest; this is due to the excessive moisture 
from the clouds which continually hang about the summits. In 
Bataan Province, the vegetation is very dense and the forests possess 
considerable commercial value. The Cinco Picos Range, however, 
is almost bare. 
The southeastern volcanic cluster—In northern Ambos Cam- 
arines, as I have already mentioned, the Cordillera bifurcates: 
one fork running through the Caramoan Peninsula, and the other 
following the west coast. Between these two in what was originally 
a more or less level plain, there has been built up a cluster of 
volcanic cones more or less dissected by erosion. However, there 
is one very perfect cone, Mount Mayon, which is probably the most 
perfect volcanic cone in the world. This is the highest of the 
group, and is only a short distance from Legaspi. What must have 
been a larger cone at one time, is now represented by Mount Isarog; 
but the symmetry of this has been destroyed by one side of the 
