This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1815 edition. Excerpt: ...properties of different menstruums, and the manner of applying the fire or heat, may cause some alterations in the form wherein metals open themselves. PRECEPT. '-1. Observation should be made, what kind of dilatation happens in the opening of metals; as whether it be like that of leaf-gold, which is a spurious rarifaction, wherein the body is dilated rather in place than substance, after the manner of powders; or whether the body of the metal be actually dilated in substance. This may be determined by the following experiment. Take an exact weight and measure of quicksilver, and so of aqua-fortis, after the manner of our first table; then make a solution thereof, and-weigh it in the two vessels, wherein the quicksilver and aqua fortis were separately weighed; and observe whether the weight and measure of the Compound exactly answer to the weight and measure of the same bodies, when separate. We make choice of quicksilver for this experiment, Some attempt of this kind was made by Dr. Hook, and Br. Grew, but the matter perhaps has not been duly prosecuted. because, as it dissolves without fire, there is the less suspicion of waste. 2. It should be observed, whether a solution of quicksilver may not support the heaviest stones, or even tin, so as to keep them floating. This might be collected from knowing the proportions of their specific gravities. And let not this be suspected as tending to miracle and imposture; but.only to the investigation of the nature of mixture. OBSERVATION. It is worth observing, that all metals, though remarkably heavier than the menstruums in which they dissolve, yet ascend in the form of sand or bubbles, during the first act of solution: and this is the more considerable where they do the same without fire, as...
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