CO129-408 - Public Offices & Others - 1913 — Page 401

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#AUSES OF MALARIA

THE DIGGING TEBORY DISCUSSED

In his report on malaria in Mauritius Professor Ross under #Is Malaria due to the soil deals with various contentions urged against the anopheline theory, sayāt.

377

In section 1 we saw that the theory of the marsh miasm gradually grew into the telluric hypothesis, according to which malaria is caused by a poison which exists in suitable soil and which escapes from it when it is disturbed; and instances which apparently support this idea are still cited. From what has just been said the reader will gather that many of them are probably only relapses occurring among previously infected workmen; while o others may quite possibly be caused by anophelines bred in marshes close to the spot where the soil has been disturbed, But nevertheless malaria may be caused actually by the digging though not in the way suggested by the telluric hypothesis.

..

Hence we must end by admitting that disturbance of the soil is really apt to cause malaria; but that it may do so, not by liberating any tellurio miasm, but by encouraging the breeding of the Anopheles and the occurrences of relapses among workmen.

NOTE

by 4. G. 5.- The discovery in 1908, by Mr. J, Grant Smith of Hongkong, of a distinct poisonous gas emanating from the soil and rocks, settles the question of the origin

of malaria, in favor of the oldest and best known tellurio theory.