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soiled white hat on the ground beside him, on which was fastened a pilgrim's cockle shell, and there was suspended round his neck a long antique blue enamelled phial, like those found in the Greek tombs, and it was attached to a rosary of coarse beads. He took up his hat, and appeared to be retiring to another part of the building, when I apologised for the interruption we had given to his studies, begged him to resume them, and assured him that our stay in the building would be only momentary, for I saw that there was a cloud over the sun, the brightness of which was the cause of our retiring. I spoke in Italian; he replied in English, observing that he supposed the fear of contracting the malaria fever had induced us to seek the shelter of the shade: but it is too early in the season to have much reasonable fear of this insidious enemy; yet, he added, this bottle which you may have observed here at my breast, I carry about with me, as a supposed preventive of the effects of malaria, and as far as my experience, a very limited one, however, has gone, it is effectual. I ventured to ask him what the bottle might contain, as such a benefit ought to be made known to the world. He replied, "It is a mixture which slowly produces the substance called by chemists chlorine, which is well known to be generally destructive to contagious matters; and a friend of mine who has lived for many years in Italy, and who has made a number of experiments with it, by exposing himself to the danger of fever in the worst seasons and in the worst places, believes that it is a secure preventive. I am not convinced of this; but it can do no harm; and in waiting for more evidence of its utility, I employ it without putting the least confidence in its power; nor do I expose myself to the same danger as my friend has done for the sake of an experiment." I said, "I believe several scientific persons--Brocchi amongst others--have doubted the existence of any specific matter in the atmosphere producing intermittent fevers in marshy countries and hot climates; and have been more disposed to attribute the disease to physical causes, dependent upon the great differences of temperature between day and night and to the refrigerating effects of the dense fogs common in such situations in the evening and morning; and, on this hypothesis, they have recommended warm woollen clothing and fires at night as the best preventives against these destructive diseas
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