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This points out one cause of the more frequent rains in lofty situations than in low open countries. Thus double the quantity of rain falls at Townly-hall, in Lancashire, than does in London, as we are informed in the Transactions of the Royal Society.

The heights of the quicksilver in the barometer above referred to, hold only in places on a level with the sea; for experiments have taught us, that the mercury falls considerably in inland places, according to their heights.

As your Magazine is perused by many of the most ingenious men in the kingdom, I wish they were called on to account for that power in the air of occasionally dissolving water, if I may so express it, and of mixing the water with itself (as salt is in water) generally invisible, and at other times in vapours, which soon form clouds. Winds, especially from dry continents, have great power of thus raising water. Evaporation, by means of the sun's heat, is generally mentioned as the efficient cause; but whoever attends to the quantity of snow, and even of ice, that is carried off into the air in the most severe frosts, will be convinced that heat is not the principal cause. The quantity of water thus raised into the air may be estimated by numerous springs which owe their source to vapours thus raised. The waters of these springs uniting form the greatest rivers. Add to these, the quantity that fall in dews and rain, which give birth to all vegetables, and to that beautiful verdure which gives a peculiar beauty to this country, in the enjoyment of which, other nations envy us. As we are ignorant of the cause of this power in the air, of dissolving water, so are we no less ignorant whence it is that the air occasionally drops these vapours in dews, rains, &c.

1789, April.

AGRICOLA.

LI. Experiments in Natural Philosophy.

MR. URBAN,

AN account of a loaf loaded with quicksilver being thrown into water to discover the body of a person sunk under the surface, which could only become stationary (if it did so) from attraction, encouraged me to offer the following, in hopes that some one may improve upon the hint:

Being under the cliff at Scarborough, I observed two persons looking very earnestly at the different oozings of the

water that dribbled down the sides, and tasting the moisture by dipping in their fingers. I went to them, and found them Germans. They were very obliging; and, as I understood the language, informed me they were very well versed in searching after mines, which by thus tasting the water they could discover. I mentioned what I had heard of the divining rod, in use on the Mendip Hills, in Somersetshire, which bends when held over places that contain metallic ore; they said that might well be, for a piece of gold, silver, or any metal, suspended on the end of a very slender switch, when carried over a mine of the same metal, would be so attracted as to bend the end of the stick. Some time after, I happened to be at a silversmith's at Bath, who had a very curious pair of scales, inclosed in a glass case. I admired them; and he said they would weigh to the 200th part of a grain; and there lay in the window a block of solid silver, about six inches square and two inches thick. What the above-mentioned persons told me at Scarborough came into my head, and I thought this a good opportunity to try how far what they said was true. I, therefore, had a shilling put into one scale, and the beam, which was about 18 inches long, made perfectly level by weights in the other scale; then I introduced the block of silver under the scale that had the shilling, and the beam dropped at that end a full quarter of an inch, and stood there until the block of silver was removed, when it immediately returned to the equipoize and level it was before: and this we repeated several times, and it always answered the same. These curious scales were inclosed in the glass case, and the door shut, at every experiment.

The other matter, I think, may be made useful for keeping metal pipes or boilers from the furring, or stony excres cence, that lodges from boiling water often in them. A friend of mine at Rochester put a common flat shell of an oyster into a new tea-kettle, and kept it in two or three years. During all this time the shell was in the tea-kettle, the tea-kettle gathered no fur, but all the furring settled on the oyster shell, which I have in my possession now, and which is about two inches thick, and something bigger than it was when put in, and perfectly smooth at the bottom, and where at the edge it had from time to time slipped against the side of the tea kettle, in appearance like a hone you set razors on; but on the top of the shell the fur was like any thing boiling up, curly and uneven. The water there comes from chalky lands. I live in Essex, and have tried the shell, which also gathered the fur, but of a different

appearance, being more like smooth sand or gravel; but the shell increased in thickness. If this can be turned to account, in respect to keeping boilers and pipes clear, or shewing the nature of the land through which the streams have passed, I shall be happy.

1791, March.

Н.

INDEX

TO THE

SECOND VOLUME.

ABRAXAS, 41.

Accents, Dissertation on, 385.

Achates, meaning of, 357.

Achates, in Virgil, 378.

Acta Diurna, 1.

A.

Adages, Greek and Latin, 162, 199.

Adam, his beard, 293;-his voice, 294..

Addison, 36;-on Paradise Lost, 360, 368;-his observation on
Virgil's Achates, 378.

Enigma, antiquity of the, 40.

Eschylus, 170.

Ajax, the silence of, in the infernal shades, 164.
Albumazar, comment on the old play of, 98.

Alfred, 117.

Allegories in ancient history accounted for, 95.

Alphabet, the Greek, 213.

Analogy of language, remarks on, 173, note.

Ancient Universal History, 255.

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Arabian Tales, on the Authenticity of, 382

Architecture, Treatises on Saxon and Gothic, 249.

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Assassin, origin of the word, 146.

Astle on Writing, 281.

Atherton Cliffs, natural curiosities found at, 458.
Auca the signification of, 113.

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Barometer, the utility of, in agriculture, 523.
Barrigenæ, who, 129, 131.

Bartholin, 521.

Barton, 357.

Bath Waters, phenomenon of the, 488.

Bathurst, Dr. Ralph, his death, 495.

Baudius, his Latin verses addressed to his friends, 171.
Beards, extraordinary remarks relating to, 293.

Bede, 117.

Bentham, on Saxon and Gothic Architecture, 249.

Bentley, a passage from one of his Sermons, 246;-on Paradise
Lost, 361.

Bible, various English translations of, 116;-translators of, 120;-
revision of the English, 148.

Bibles, Manuscript, 16.

Biblical difficulty obviated, 93.

Birds, their power of digestion, 427;-carnivorous, 433.

Blayney, Dr. his account of the collation and revision of the Eng-
lish Bible, 148.

Bleak, on the word, 238.

Bones, on the brittleness of, in frosts, 494;-whether oily sub-
stances are hurtful to, 497;-fossil, discovered in several
countries, 460.

Bonfire, 202.

Borsholder, 201.

Bourn, whence derived, 356.

Breviaries, 23.

Bristol, fossil bones dug up near, 461.

Broom, 202.

Buchanan, 43.

Bull's Blood, a poison among the Ancients, 414.

Burton, his Latin Preface intended for the History of Leicester-

shire, 378.

Burton, in Sussex, elephants' bones found at, 460.

Butler, 357.

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