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Again，thecomplaintisoftenheardthatthenativepopulationisnotincreasingsorapidlyasinformergenerations。ThebreedingandnursingperiodofAmericanwomenisoneofpeculiardelicacyandfrequentinfirmity。Manyofthemmustrequireaconsiderableintervalbetweenthereproductiveefforts，torepairdamagesaridregainstrength。Thismatterisnottobedecidedbyanappealtounschoolednature。Itisthesamequestionasthatofthedeformedpelvis，——oneofdegree。Thefactsofmal-vitalizationareasmuchtobeattendedtoasthoseofmal-formation。Ifthewomanwithatwistedpelvisistobeconsideredanexempt，thewomanwithadefectiveorganizationshouldberecognizedasbelongingtotheinvalidcorps。Weshuddertohearwhatisallegedastotheprevalenceofcriminalpractices；ifbackofthesetherecanbeshownorganicincapacityorovertaxingoftoolimitedpowers，thefactsbelongtotheprovinceofthepracticalphysician，aswellasofthemoralistandthelegislator，andrequirehisgravestconsideration。
Taketheimportantquestionofbleeding。Isvenesectiondonewithforever？SixyearsagoitwassaidhereinanintroductoryLecturethatitwoulddoubtlesscomebackagainsoonerorlater。AfortnightagoIfoundmyselfinthecarswithoneofthemostsensibleandesteemedpractitionersinNewEngland。Hetookouthiswalletandshowedmetwolancets，whichhecarriedwithhim；hehadnevergivenuptheiruse。Thisisapointyouwillhavetoconsider。
Or，tomentiononeoutofmanyquestionableremedies，shallyougiveVeratrumVirideinfeversandinflammations？Itmakesthepulseslowerintheseaffections。Thenthepresumptionwouldnaturallybethatitdoesharm。ThecautionwithreferencetoitonthisgroundwaslongagorecordedintheLectureabovereferredto。SeewhatDr。
JohnHughesBennettsaysofitintherecenteditionofhisworkonMedicine。Nothingbutthemostcarefulclinicalexperiencecansettlethisandsuchpointsoftreatment。
Theseareallpracticalquestions——questionsoflifeanddeath，andeverydaywillbefullofjustsuchquestions。Taketheproblemofclimate。Apatientcomestoyouwithasthmaandwantstoknowwherehecanbreathe；anothercomestoyouwithphthisisandwantstoknowwherehecanlive。Whatboy’splayisninetenthsofallthatistaughtinmanyapretentiouscourseoflectures，comparedwithwhatanaccurateandextensiveknowledgeoftheadvantagesanddisadvantagesofdifferentresidencesintheseandothercomplaintswouldbetoapractisingphysicianIsawtheotherdayagentlemanlivinginCanada，whohadspentsevensuccessivewintersinEgypt，withtheentirereliefofcertainobscurethoracicsymptomswhichtroubledhimwhileathome。Isaw，twomonthsago，anothergentlemanfromMinnesota，anobserverandamanofsense，whoconsideredthatStateasthegreatsanatoriumforallpulmonarycomplaints。Ifhalfourgrownpopulationareorwillbemoreorlesstuberculous，thequestionofcolonizingFloridaassumesanewaspect。EvenwithinthebordersofourownState，theveryinterestingresearchesofDr。Bowditchshowthatthereisagreatvariationintheamountoftuberculousdiseaseindifferenttowns，apparentlyconnectedwithlocalconditions。ThehygienicmapofaStateisquiteasvaluableasitsgeologicalmap，anditisthebusinessofeverypractisingphysiciantoknowitthoroughly。TheyunderstandthisinEngland，andsendapatientwithadryirritatingcoughtoTorquayorPenzance，whiletheysendanotherwithrelaxedbronchialmembranestoCliftonorBrighton。Hereisanothergreatfieldforpracticalstudy。
Soastotheall-importantquestionofdiet。“Ofallthemeansofcureatourcommand，“saysDr。Bennett，“aregulationofthequantityandqualityofthedietisbyfarthemostpowerful。“Dr。MacCormacwouldperhapsexcepttheairwebreathe，forhethinksthatimpureair，especiallyinsleepingrooms，isthegreatcauseoftubercle。
ItissufficientlyprovedthattheAmerican，——theNewEnglander，——theBostonian，canbreedstrongandsoundchildren，generationaftergeneration，——nay，Ihaveshownbytherecordofaparticularfamilythatvitallossesmayberetrieved，andafeebleracegrowtolustyvigorinthisveryclimateandlocality。Isnotthequestionwhyouryoungmenandwomensooftenbreakdown，andhowtheycanbekeptfrombreakingdown，farmoreimportantforphysicianstosettlethanwhetherthereisonecranialvertebra，orwhethertherearefour，ornone？——
ButIhaveatasteforthehomologies，Iwanttogodeeplyintothesubjectofembryology，Iwantt
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