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Thereasonwhyweteachsomuchthatisnotpracticalandinitselfuseful，isbecausewefindthattheeasiestwayofteachingwhatispracticalanduseful。Ifwecouldinanywayeliminateallthatwouldhelpamantodealsuccessfullywithdisease，andteachitbyitselfsothatitshouldbeastenaciouslyrootedinthememory，aseasilysummonedwhenwanted，asfertileinsuggestionofrelatedfacts，assatisfactorytotheperemptorydemandsoftheintelligenceasiftaughtinitsscientificconnections，Ithinkitwouldbeourdutysototeachthemomentoustruthsofmedicine，andtoregardalluselessadditionsasanintrusiononthetimewhichshouldbeotherwiseoccupied。
Butwecannotsuccessfullyeliminateandteachbyitselfthatwhichispurelypractical。Theeasiestandsurestwhyofacquiringfactsistolearnthemingroups，insystems，andsystematizedknowledgeisscience。Youcanveryoftencarrytwofactsfastenedtogethermoreeasilythanonebyitself，asahousemaidcancarrytwopailsofwaterwithahoopmoreeasilythanonewithoutit。Youcanrememberaman’sface，madeupofmanyfeatures，betterthanyoucanhisnoseorhismouthorhiseye-brow。Scoresofproverbsshowyouthatyoucanremembertwolinesthatrhymebetterthanonewithoutthejingle。
Theancients，whoknewthelawsofmemory，groupedthesevencitiesthatcontendedforthehonorofbeingHomer’sbirthplaceinalinethusgivenbyAulusGellius：
Smurna，Rodos，Colophon，Salamin，Ios，Argos，Athenai。
Iremember，intheearlierpoliticaldaysofMartinVanBuren，thatColonelStone，ofthe“NewYorkCommercial，“oroneofhiscorrespondents，saidthatsixtownsofNewYorkwouldclaiminthesamewaytohavebeenthebirth-placeofthe“LittleMagician，“ashewasthencalled；andthushegavetheirnames，anyoneofwhichI
shouldlongagohaveforgotten，butwhichasagrouphavestucktightinmymemoryfromthatdaytothis；
Catskill，Saugerties，Redhook，Kinderhook，Scaghticoke，Schodac。
Ifthememorygainssomuchbymererhythmicalassociation，howmuchmorewillitgainwhenisolatedfactsarebroughttogetherunderlawsandprinciples，whenorgansareexaminedintheirnaturalconnections，whenstructureiscoupledwithfunction，andhealthyanddiseasedactionarestudiedastheypassoneintotheother！
Systematic，orscientificstudyisinvaluableassupplyinganaturalkindofmnemonics，iffornothingelse。YoucannotproperlylearnthefactsyouwantfromAnatomyandChemistryinanywaysoeasilyasbytakingthemintheirregularorder，withotheralliedfacts，onlytheremustbecommonsenseexercisedinleavingoutagreatdealwhichbelongstoeachofthetwobranchesaspurescience。Thedullestofteachersistheonewhodoesnotknowwhattoomit。
Thelargeraimofscientifictrainingistofurnishyouwithprinciplestowhichyouwillbeabletoreferisolatedfacts，andsobringthesewithintherangeofrecordedexperience。Seewhatthe“LondonTimes“saidaboutthethreeGermanswhocrackedopenJohnBullChatwood’sstrong-boxattheFairtheotherday，whilethethreeEnglishmenhammeredawayinvainatBrotherJonathanHerring’s。TheEnglishmenrepresentedbruteforce。TheGermanshadbeentrainedtoappreciateprinciple。TheEnglishman“knowshisbusinessbyroteandruleofthumb“——science，whichwould“teachhimtodoinanhourwhathashithertooccupiedhimtwohours，““isinamannerforbiddentohim。“Tothiscausethe“Times“attributesthefallingoffofEnglishworkmenincomparisonwiththoseoftheContinent。
Grantingallthis，wemustnotexpecttoomuchfrom“science“asdistinguishedfromcommonexperience。Therearetenthousandexperimenterswithoutspecialapparatusforeveryoneinthelaboratory。Accidentisthegreatchemistandtoxicologist。Battleisthegreatvivisector。HungerhasinstitutedresearchesonfoodsuchasnoLiebig，noAcademicCommissionhaseverrecorded。
Medicine，sometimesimpertinently，oftenignorantly，oftencarelesslycalled“allopathy，“appropriateseverythingfromeverysourcethatcanbeoftheslightestusetoanybodywhoisailinginanyway，orliketobeailingfromanycause。Itlearnedfromamonkhowtouseantimony，fromaJesuithowtocureagues，fromafriarhowtocutforstone，fromasoldierhowtotreatgout，fromasailorhowtokeepoffscurvy，fromapostmasterho
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