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I have already endeavoured to explain 
the influence of the electrical principle 
upon the animal economy; but as this was 
done in a curfory manner, I Aiall here 
take up the matter anew, and this exami¬ 
nation may be confldered as the final ana- 
lyfis of our doCtrine. 
I propofe treating of mufcular motion, 
the fecretions, fenfations, and nutrition, 
both in the ftate of nature and that of dil¬ 
ea fe. 
From amongft the immenfity of objects 
which this widely-extended field prefents 
to my conlideration, I fliall only feleCt 
thofe which appear to me molt relevant to 
the fubjeCt, and molt ufeful to the art of 
healing. 
Of Muscular Motion. 
Phyfiologifts acknowledge the exifienee 
of three diftinCt powers in mufcles, viz. 
ifl, Contractility, 
td, Irri- 
