73" On the Effects of Opium 



of course, produce evident action : and this 

 did appear to be the effect of opium in the ex- 

 periment above quoted, viz. Exp. 4th. 

 ' These deductions being admitted, in order 

 to have a correct idea of the effect of a stimu- 

 lant operation, we should deifine a stimulus to 

 be " a power which encreases the action of 

 " the heart and arteries, the energy of the 

 " brain, and diminishes or exhausts the ex- 

 *< Citability of the system." 



CHAP. II. 



?iOV;>* ; 



OUR attention is next called to examine 

 what is the effect of powers termed sedative, 

 when applied to the animal body ; for by this 

 term is understood the operation of a power 

 presenting phcenomena directly the reverse 

 of those exhibited under the operation of sti- 

 rnulants. The condition induced by these 

 means we shall compare with the effects re- 

 sulting from the exhibition of opium, in order 

 that the analogy we have attempted to estia- 

 blish, may be rendered more complete by the 

 aid of contrast. 



'-•Amongst the various sedative powers enu- 

 merated by authors, there is none concerning 

 o. 



