He thought that malaria
could be carried _up_ a slope, but has never been known to descend, and
that, consequently, an intervening hill affords sufficient protection
against marsh malaria. He had known cases where the edges of a river were
healthy and the uplands malarious.

In Santa Maura and Zante, where he had been stationed with the army, he
had observed that the edge of a marsh would be comparatively healthy,
while the higher places in the vicinity were exceedingly unhealthy. He
thought that there were a great many mixed diseases which began like ague
and terminated very differently; those diseases would, no doubt, assume a
very different form if they were not produced by the marsh air; many
diseases are very difficult to treat, from being of a mixed character
beginning like marsh fevers and terminating like inflammatory fevers, or
diseases of the chest.

Dr. George Farr testified that rheumatism and tic-doloreux were very
common among the ladies who live at the Woolwich Arsenal, near the Thames
marshes. Some of these cases were quite incurable, until the patients
removed to a purer atmosphere.

W. H. Gall, M. D., thought that the extent to which malaria affected the
health of London, must of course be very much a theoretical question; "but
it is very remarkable that diseases which are not distinctly miasmatic, do
become much more severe in a miasmatic district. Influenzas, which
prevailed in England in 1847, were very much more fatal in London and the
surrounding parts than they were in the country generally, and influenza
and ague poisons are very nearly allied in their effects. Marsh miasms are
conveyed, no doubt, a considerable distance. Sufficiently authentic cases
are recorded to show that the influence of marsh miasm extends several
miles." Other physicians testify to the fact, that near the Thames
marshes, the prevalent diseases are all of them of an aguish type,
intermittent and remittent, and that they are accompanied with much
dysentery. Dr. John Manly said that, when he first went to Barking, he
found a great deal of ague, but since the draining, in a population of ten
thousand, there are not half-a-dozen cases annually and but very little
remittent.

The following Extract is taken from the testimony of Sir Culling Eardly,
Bart.:

"Chairman:--I believe you reside at Belvidere, in the parish of
Erith?--Yes.--Ch.: Close to these marshes?--Yes.--Ch.: Can you speak from your
own knowledge, of the stat