CO129-408 - Public Offices & Others - 1913 — Page 356

334

h. MARTIN CLARK On MALARIA.

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notes

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the Canal of St. Martin was excavated. ▲ most fatal fever dev-

asted Hong Kong when the hill behind the city was broken up

for building purposes. Labuan was ravaged by malaria when the

harbour works were constructed, and, in my own experience, the

laying out of some signty miles of new railway, which entailed

agood deal of earth-work, was accompanied by severe malarial

fevers, Subsoil water is a potent factor in malaria-production.

Deadly malaria may be present where the surface is composed

solely of rock and there is no subsoil water. The most famous

case on record is the hill behind the city in Hong Kong. The

rock is pure granite, but Dr. Maclean that it is disintegrated and loaded with fungi, while another observer, Dr. Black, statealhalilis

"ao porus that it is something like a mineral bog." In the absence

of rain and subsoil water, moisture must, Ishould think, be

supplied by heavy dew. But in all instances of malarial diseasea

occuring in places where they cannot, apparently, be locally

produced, we must not forget the possibility of infection from

• distance, Malaria appears to be heavier than air, and, given

winds powerful enough to propel it but not strong enough to

dispel it, there is no valid reason why it should not be carried

considerable distances. The density of malaria is also notewor-

thy in another way. In comparatively flat countries, bordered

by hills, any little valley or hollow is a most dangerous place

between sunset and a short time after sunrise. This fact concer-

ning the weight of malaria has its practical application in the

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