malignant diseases disappear. It seems that as this wind immediately follows the rainy season on the African coast, during which diseases are induced by an excess of moisture, the harmattan, invested with extraordinary dryness, removes humidity from the atmosphere, and counteracts its effects. The Sirocco is analogous to the Khamsin, but milder. It is a hot south-east wind prevailing in the Mediterranean, in Italy and Sicily, but felt most violently in the country around Naples, and at Palermo. It sometimes commences faintly about the summer solstice, but blows occasionally with great force in the month of July. Mr. Brydone, writing from Palermo, and referring to July 8th, observes— “On Sunday, we had the long-expected sirocco wind, which, although our expectations had been raised pretty high, yet I own greatly exceeded them. Friday and Saturday were uncommonly cool, the mercury never being higher than 72½: and, although the sirocco is said to have set in early on Sunday morning, the air in our apartments, which are very large, with high ceilings, was not in the least affected by it at eight o’clock, when I rose. I opened the door without having any suspicion of such a change, and, indeed, I never was more astonished in my life. The first blast of it on my face felt like the burning steam from the mouth of an oven. I drew back my head and shut the door, calling out to Fullarton that the whole atmosphere was in a flame. However, we ventured to open another door that leads to a cool platform, where we usually walk; this was not exposed to the wind, and here I found the heat much more supportable than I could have expected from the first specimen I had of it at the other door. It felt somewhat like the subterraneous sweating-stoves at Naples, but still much hotter. In a few minutes, we found every fibre greatly relaxed, and the pores opened to such a degree, that we expected soon to be thrown into a profuse sweat. I went to examine the thermometer, and found the air in the room as yet so little affected that it stood only at 73. The preceding night it was at 72½. I took it out in the open air, when it immediately rose to 110, and soon after to 112; and I am confident, that in our old lodgings, or anywhere within the city, it must have risen several degrees higher. The air was thick and heavy, but the barometer was little affected—it had fallen only about a line. The sun did not once appear the whole day, otherwise I am persuaded the heat must have been insupportable; on that side of our platform which is exposed to the wind, it was with difficulty we could bear it for a few minutes. Here I exposed a little pomatum, which was melted down as if I had laid it before the fire. I attempted to take a walk in the street, to see if any creature was stirring, but I found it too much for me, and was glad to get up stairs again. This extraordinary heat continued till three o’clock in the afternoon, when the wind changed at once, almost to the opposite point