The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . ey constitute the basis of all our knowledge respecting thecomposition and affection of matter. GRAVITATION. 37. This force acts on bodies remotely situated with respectto each other, directly in proportion to the quantity of matter,and inversely as the square of the distance. It is the operationof this power which maintains the moon in her orbit, and up-holds the
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . ey constitute the basis of all our knowledge respecting thecomposition and affection of matter. GRAVITATION. 37. This force acts on bodies remotely situated with respectto each other, directly in proportion to the quantity of matter,and inversely as the square of the distance. It is the operationof this power which maintains the moon in her orbit, and up-holds the circulation of the whole system of planets aroundthe sun, and which causes every body upon our globe to falltowards its centre, or in other words, in a line perpendicularto its surface. 38. Since the force of Gravitation is in proportion to thequantity of matter, it necessarily follows, from the globularlorm of the earth, that it will act in the direction of a linepassing through its centre ; for the longest line that can bedrawn is a diameter, and which must therefore pass throughthe greatest quantity of matter contained in any one direction.,as the annexed diagram may more clearlv illustrate, 7 dO IARISS MEDICAL 39. As the gravity of any massis only the sum of that of its par-ticles, it may be employed as theexpression of quantity of matter,, whence the theory of the balancebecomes obvious.* Since, how-lever, it has been just stated, thatmatter gravitates with a forcewhich diminishes as the squaresof the distance, it is evident thatthe weight of a body cannot bethe same in all places and situations. It is stated by ProfessorLeslie that a lump of lead, which weighs a thousand poundsat the surface of our globe, would lose two pounds, as indi-cated by a spiral spring, if carried to the top of a mountainfour miles high; and, if it could be conveyed as deep into thebowels of the earth, it would lose one pound. The samemass transported from Edinburgh to the Pole would g
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