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Página 532 - Thus, the force of aqueous vapour of 2 12° is equal to 30 inches of mercury ; at 30' below, or 182°, it is of half that force; and at 40° above, or 252°, it is of double the force ; so likewise the vapour from sulphuric ether which boils at 102°, then supporting 30 inches of mercury, at 30°...
Página 243 - ... that, in all the operations of art and nature, nothing is created ; an equal quantity of matter exists both before and after the experiment : the quality and quantity of the elements remain precisely the same, and nothing takes place beyond changes and modifications in the combinations of these elements. Upon this principle, the whole art of performing chemical experiments depends...
Página 21 - The mind, when actuated by such, is ever ready to engage in party feuds : for the men of large influence in communities, avowing on both sides a specious cause, some standing up for the just equality of the popular, others for the fair decorum of the aristocratical government, by artful sounds embarrassed those communities for their own private lucre. Both sides, intent on victory, carried on the contention with the keenest spirit. They most daringly projected, and then regularly executed the most...
Página 34 - Lauro-cerasus) is a good match to a stick of red sealing-wax; and the back of the leaf answers to the lighter red of wafers. Hence it will be immediately concluded, that I see either red or green, or both, different from other people. The fact is, I believe that they both appear different to me from what they do to others. Green and orange have much affinity also.
Página 29 - I was apprized of any peculiarity in my vision. I had not, however, attended much to the practical discrimination of colours, owing, in some degree, to what I conceived to be a perplexity in their nomenclature. Since the year 1790, the occasional study of botany obliged me to attend more to colours than before. With respect to colours that were white, yellow, or green. I readily assented to the appropriate term. Blue, purple, pink, and crimson appeared rather less distinguishable; being, according...
Página 661 - Gisborne, An Enquiry into the Duties of Men in the Higher and Middle Classes of Society in Great Britain, resulting from their Respective Stations, Professions, and Employments (London, 1794).
Página 31 - To me it is quite otherwise — I see only two or at most three distinctions. These I should call yellow and blue: or yellow, blue and purple. My yellow comprehends the red, orange, yellow and green of others; and my blue and purple...
Página 32 - All crimsons appear to me to consist chiefly of dark blue; but many of them seem to have a strong tinge of dark brown. I have seen specimens of crimson, claret, and mud, which were very nearly alike. Crimson has a grave appearance, being the reverse of every shewy and splendid colour. Woollen yarn dyed crimson or dark blue is the same to me.
Página 567 - ... of the particles of air ; and is similar to that which a stream of water meets with in descending amongst pebbles.
Página 365 - That they are principally supplied by large subterranean reservoirs of water. 3d. That they derive their water originally from the sea, on the principle of filtration. It is obvious, that before we pay any attention to the two latter opinions, the causes assigned in the first ought to be proved insufficient by direct experiment. M. de la Hire is the only one who has attempted to do this, as far as my information extends, in the Parisian Memoiri for 1703.