. The Pharmaceutical era. the names of the elements and compounds inwriting and speaking. It would commonly be consideredbad form to order chemicals from a wholesaler by thoirsymbols or formulas, unless where there are differentcompounds having the same or nearly the same such eases the formula should be used in ro)iiii liimiiiith the inoper tUujliKh title, to indicate the particularcompound wanted. So. also, it is generally bad taste touse the symbols and formuhv in conversation, as forinstance to say, I dissolved 5 grains of 1 in a fluidounce of HjO with the aid of 10 grains of KI. T
. The Pharmaceutical era. the names of the elements and compounds inwriting and speaking. It would commonly be consideredbad form to order chemicals from a wholesaler by thoirsymbols or formulas, unless where there are differentcompounds having the same or nearly the same such eases the formula should be used in ro)iiii liimiiiith the inoper tUujliKh title, to indicate the particularcompound wanted. So. also, it is generally bad taste touse the symbols and formuhv in conversation, as forinstance to say, I dissolved 5 grains of 1 in a fluidounce of HjO with the aid of 10 grains of KI. The use of symbols in prescriptions is likewise of ques-tionable propriety, unless by their addition to the writtennames they aid in fixing the identity of the articlewanted. LECTURE NO. 10. Pharmaceutical Physics. Pneumatics Continued. Mass and Volume Relations. Torriceilis Experiment.—That the atmosphere really doespossess weight can be shown liy Torriceilis experi-ment. A glass tube, closed at one end. is filled with. Fig. 20.—Torriceilis Experiment. mercury, the open end closed with the thumb, the tubeinverted and the oi>en end dipped under mercury con- tained in a vessel. The pressure of the atmosphere willmaintain the liquid in the tube. (Fig. 20.) That it is the air pressure which sustains the columncan be proved by placing such an apparatus of smallersize under the receiver of au air pump and exhaustingthe air. when the mercury i)romptly falls out of thetube. The Barometer.—Si\ch a tube of sufficient length andfastened with its mercury cistern to a suitable supi>ortconstitutes the mercurial barometer in its simplest form.(Fig. 21.) The mercury cistern (concealed in the figure)being left open to the air. variations in thepressure of the latter will be indicated bycorresponding elevations or depressions nfthe column. Other liipiids might be used in the barom-eter instead of mercury, the only advantageof the latter liquid are its greater weight,whereby
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
