第17章欢乐是一门哲学aidforTwelveLaughs（2）
Durihemovemeomacharesimilart。Everytimeyoutakeafullbreath，orwhenyouatewell，thediaphragmdesdgivesthestomaextrasqueezea。
&laughiomag，hurryiiveprocess。Theheartbeatsfaster，ahebloodboundingthroughthebody。“Thereisnot，”saysDr。Greeerorlittleiheminuteblood-vesselsofthehumanbodythatdoesnotfeelsomewaveletfromthesoedbyagh。”Ierms，itstimulatesthevasomotordthespasmoditraoftheblood-vesselscausesthebloodtoflowquickly。Laughteracceleratestherespiratiohandglowtothewholesystem。Itbrightenstheeye，iheperspiratiohechest，forcesthepoisonedairfromtheleast-usedluehatexquisitepoiseorbalancewhichwecallhealth，whichresultsfromtheharmoniousaofallthefunsofthebody。Thisdelicatepoise，whichmaybedestroyedbyasleeplessnight，apieceofbadnews，bygrieforaenwhollyresth。
&y，andfeararegreatenemiesofhumanlife。Adepressed，sour，melancholysoul，alifewhichhasceasedtobelieveinitsowsonmission，alifewhiksintetatingaimlessness，hasbeecrippledanduseless。Weshouldfightagainsteveryiehemind，aswewouldagaiioisuruethat，asarule，themindhaspthentheperiodofyouthfulahay，preservingandrenewingphysicallifebyastalwartmeh。
&herdayofamaninaneighbcitywhowasgivenuptodie;hisrelativesweresentfor，achedathisbedside。Butanoldace，who，assuredhimsmilinglythathewasallrightandwouldsooalkedinsuchastrainthatthesiwasforcedtolaugh;asorousedhissystemthatherallied，andhewassoon>
WasitnotShakespearewhosaidthat“alightheartliveslong?”
Physiologytellsthestreatsympathetiervesarecloselyallied;acarriesbadhehead，thehestomachareaffedigestionesoenanesdoleful。Laughwhenyou;itisacheapmedie。Merrimentisaphilosophynotwelluheemisurgeohatweoughttobeginwiththebabiesandtraiohabitsofmirth：“Enceyourerryandlaughaloud;aghexpaahebloodb。etoagoodlaugh—nottoalittlesniglaugh，buttoowillsoundfightthroughthehouse。Itwillnotonlydood，butwillbeabeoallwhohear，andbeanimportantmeansthebluesawayfromadwelliisveryg，andspreadsinaremarkablemanner，fewbeioresistits。Aheartylaughisdelightfulharmohebestofallmusic。”
“withouthilarity，”saysahor，“willtomuch。Treeswithoutblossomswill。”