dispensed with in the pulley block shown in the doubtless jike many others, without foundation. Of inhalation of nitrous oxide gas as an ex~itant and an anesthetic. From what we have seen of the appara- course, horses cannot get away when they are tied, engraving. When the workman hauls on the… … ning atthe same depth trated; the engraving as the true groove of explains itself. The in- the pulley (shown by the arrow in Fig. 1 ) and old laughing-gas of Sir Humphrey Davy again gal- vention is merely a stout bolt, A, provided with vanized into life and notice ; and since, in the hands running…
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