Essays of Jean Rey, Doctor of Medicine, on an Enquiry Into the Cause Wherefore Tin and Lead Increase in Weight on Calcination. (1630)

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W. F. Clay, 1895 - Combustion, Theory of - 54 pages
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Page 36 - That this increase in weight comes from the air, which in the vessel has been rendered denser, heavier, and in some measure adhesive, by the vehement and long-continued heat of the furnace : which air mixes with the calx [frequent agitation aiding] and becomes attached to its most minute particles : not otherwise than water makes heavier sand which you throw into it and agitate, by moistening it and adhering to the smallest of its grains'.
Page 15 - ... one into the other, lose or gain weight, according as in changing they become rarefied or condensed. With the arms of reason I boldly enter the lists to combat this error, and to sustain that weight is so closely united to the primary matter of the elements that they can never be deprived of it But not presuming that my statements are on a parity with those of Pythagoras, so that it suffices to have advanced them, I support them with a demonstration which, as I conceive, all men of sense will...
Page 52 - The calx is in this condition : the condensed air becomes attached to it, and adheres little by little to the smallest of its particles : thus its weight increases from the beginning to the end, but when all is saturated it can take up no more. ' Do not continue your calcination in this hope : you would lose your labour.
Page 36 - Brun, which is, that having placed two pounds six ounces of fine English tin in an iron vessel and heated it strongly on an open furnace for the space of six hours with continual agitation and without adding anything to it, he recovered two pounds thirteen ounces of a white calx; which filled him at first with amazement, and with a desire to know whence the seven ounces of surplus had come.
Page 54 - Libavius have carefully sought it, but never perceived it. Others may be on its quest, but vainly if they fail to follow the road which I, first of all, have made clear and royal : all others being but thorny footpaths and inextricable byways which lead never to the goal. This labour has been mine ; may the profit be to the reader, and to God alone the glory.
Page 36 - To this question then I respond and sustain proudly, resting on the foundations already laid, that this increase in weight comes from the air, which in the vessel has been rendered denser, heavier and in some measure adhesive THE THEORIES OF CHEMISTRY.
Page 14 - ... any particular theory of matter. He is attempting a kind of a priori demonstration of the principle. It is contained in a few lines: "Let there be taken a piece of earth, which has in it the least weight possible and beyond which nothing smaller can exist; let that earth be converted into water by means known and practised by nature. It is evident that this water will have weight, since all water must have it; then it will be either larger than that which was in the earth, or smaller, or equal....
Page 54 - Behold now this truth, whose brilliance strikes the eye, which I have drawn from the deepest dungeons of obscurity. This it is to which the path has been hitherto inaccessible. This it is which has distressed with toil so many learned men, who, wishing to know it, have striven to clear the difficulties which held it encircled. Cardan, Scaliger, Fachsius, Cxsalpinus, Libavius, have curiously sought it, but never perceived it.

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