. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . Strepresents the stimulus, and the numerator D the demon-strable dynamic change produced by it. In man_y cases the disproportion between the strengthof the .stimulus and the amount of demonstralile dynamicchanges wrought by it is very great, the amount of en-ergy evolved by the stimulation being often ten times oreven hundreds of times greater than the amount of energyrejiresented in or spent by the stimulus itself. Verworu gives the following interesting instance
. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . Strepresents the stimulus, and the numerator D the demon-strable dynamic change produced by it. In man_y cases the disproportion between the strengthof the .stimulus and the amount of demonstralile dynamicchanges wrought by it is very great, the amount of en-ergy evolved by the stimulation being often ten times oreven hundreds of times greater than the amount of energyrejiresented in or spent by the stimulus itself. Verworu gives the following interesting instance iusubstantiation of this statement: A nerve-muscle pre-paration is sus]iended on a myograpli, the mtiscle isloaded Avith a weight of 100 gm. and its nerve is laid overa glass plate supported by a stand (Fig. ). Uponthe nerve rests a small alum-inum pan having a sharp keelon the lower side, and intothis a weight of 10 gm. fallsfrom a height of about 10 the moment of stimulationthe muscle contracts and raisesthe 100 gm. about 1 cm. Herethe quantity of energy thatcorresponds to the work of themuscle is ten times greater thanthe quantity of energythat has operated as astimulus upon the very striking parallelfact from theinorganic worldis familiar: Thespjirk from asmall batterywhich, appliedto the hinnanbody gives ahardly notice-able sensation, is sufficient to blow up a whole house ifapifliet to a definite quantity of nitroglycerin in theproper manner. In accordance with the law of the preservation ofenergy this disproportion must be exi)laiiied, not by tlieaddition of energy not before existent, but by the traus- Fi(^ -lii.).—MprliiinicMl fniitrlvanie for Demnn-stiiiUiiL till l)isprn|Kirtjuii between StituiUusaiiit KITtTi of stimulus. (Fruiu Vorworn.)Fill-deliills see the te.\t. formation of one form of energy into another form—^forinstance, of chemical energy into physical energy. However, while in the instance of the spark explodingthe n
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