YAP, The Philippine Journal of Science 1915 
In the Philippines it is doubtful if enough of such assistants 
could, be trained and kept at work in the various malarial towns. 
The hiding places of adult mosquitoes are not necessarily con- 
fined to buildings. We found 2 adult females of Anopheles 
febrifer among roots and in a crab hole in Mindoro. The aver- 
age Filipino room in the Philippines is open to the high thatched 
roof, and the space under the house also offers lurking places 
not easily accessible. The houses on the San Jose Estate are 
for the most part provided with ceiling, and the under part of 
the houses are so ventilated that they are not favorable as hiding 
places for mosquitoes. As a result, mosquito catching on this 
estate is probably easier than would be the case in the average 
Philippine barrio. This kind of antimalarial work will probably 
be most likely to succeed on plantations or other localities where 
the work can be kept under close supervision. 
Educational work is certainly worth while, if only to make 
the people more receptive to antimalarial measures conducted 
by the authorities. We have several times talked to pupils or 
teachers in malarial towns on malaria transmission, and shown 
them specimens of anopheles breeding in the vicinity. 
The clearing of the jungle, whether woods or high cogon grass, 
has undoubtedly been a factor in the reduction of malaria in 
some parts of the Archipelago. But, as stated above, the jungle, 
especially in some coconut regions, has been imperfectly cleared 
or allowed to grow again, and some of the most malarial towns 
in the Islands have been settled for a century or more (Magda- 
lena and Majayjay, Laguna Province, and Bongabon, Nueva 
Ecija Province). 
The penetration of new territory in the Philippines by troops 
or by men employed in construction works or in the development 
of mines, plantations, or lumber industries has frequently been 
followed by severe outbreaks of malaria. We believe that much 
of this malaria could be prevented by comparatively inexpensive 
antimalarial measures undertaken early and based on an adequate 
preliminary anopheles survey and where practicable a malaria 
survey of the indigenous population. In the case of an estab- 
lishment in a hilly region where breeding places are compara- 
tively limited the destruction of larve in the neighborhood of 
camps would be especially feasible. Very little expenditure of 
time and money would have sufficed to prevent the outbreak on 
Baliuag River in Nueva Ecija (Table IX). A small construc- 
tion camp in Cebu is located immediately over a small brook 
offering excellent breeding places for anopheles, but we were 
