; andfirstoftouch.
Wecommonlyreckontheexternalsensesfiveinnumber, becausethereareasmanydifferentkindsofobjectswhichmovethenervesandtheirorgans, , thenervesterminatingintheskinofthewholebodycanbetouchedthroughthismediumbyanyterreneobjectswhatever, andmovedbythesewholes, inonewaybytheirhardness, inanotherbytheirgravity, inathirdbytheirheat, inafourthbytheirhumidity, etc.—andinasmanydiversemodesastheyareeithermovedorhinderedfromtheirordinarymotion, tothatextentarediversesensationsexcitedinthemind, , whenthesenervesaremovedalittlemorepowerfullythanusual, butnotneverthelesstothedegreebywhichourbodyisinanywayhurt, therethusarisesasensationoftitillation, whichisnaturallyagreeabletothemind, becauseittestifiestoitofthepowersofthebodywithwhichitisjoined, [inthatthelattercansuffertheactioncausingthistitillation, withoutbeinghurt].Butifthisactionbestrongenoughtohurtourbodyinanyway, , althoughsensationsofquiteanoppositecharacter, ariseneverthelessfromcausesnearlyalike.
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Inthesecondplace, theothernervesscatteredoverthetongueandthepartsinitsvicinityarediverselymovedbytheparticlesofthesamebodies, separatedfromeachotherandfloatinginthesalivainthemouth, andthuscausesensationsofdiversetastesaccordingtothediversityoffigureintheseparticles.[20]
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