But, inordertoshowhowItherehandledthismatter, Imeanheretogivetheexplicationofthemotionoftheheartandarteries, which, asthefirstandmostgeneralmotionobservedinanimals, , Iadvisethosewhoarenotversedinanatomy, beforetheycommencetheperusaloftheseobservations, totakethetroubleofgettingdissectedintheirpresencetheheartofsomelargeanimalpossessedoflungs (forthisisthroughoutsufficientlylikethehuman), andtohaveshowntothemitstwoventriclesorcavities: inthefirstplace, thatintherightside, withwhichcorrespondtwoveryampletubes, viz., thehollowvein (venacava), whichistheprincipalreceptacleoftheblood, andthetrunkofthetree, asitwere, ofwhichalltheotherveinsinthebodyarebranches; andthearterialvein (venaarteriosa), inappropriatelysodenominated, sinceitisintruthonlyanartery, which, takingitsriseintheheart, isdivided, afterpassingoutfromit, intomanybrancheswhichpresentlydispersethemselvesalloverthelungs; inthesecondplace, thecavityintheleftside, withwhichcorrespondinthesamemannertwocanalsinsizeequaltoorlargerthanthepreceding, viz., thevenousartery (arteriavenosa), likewiseinappropriatelythusdesignated, becauseitissimplyaveinwhichcomesfromthelungs, whereitisdividedintomanybranches, interlacedwiththoseofthearterialvein, andthoseofthetubecalledthewindpipe, throughwhichtheairwebreatheenters; andthegreatarterywhich, issuingfromtheheart, , likesomanysmallvalves, openandshutthefourorificesthatareinthesetwocavities, viz., threeattheentranceofthehollowveinswheretheyaredisposedinsuchamannerasbynomeanstopreventthebloodwhichitcontainsfromflowingintotherightventricleoftheheart, andyetexactlytopreventitsflowingout; threeattheentrancetothearterialvein, which, arrangedinamannerexactlytheoppositeoftheformer, readilypermitthebloodcontainedinthiscavitytopassintothelungs, buthinderthatcontainedinthelungsfromreturningtothiscavity; and, inlikemanner, twoothersatthemouthofthevenousartery, whichallowthebloodfromthelungstoflowintotheleftcavityoftheheart, butprecludeitsreturn; andthreeatthemouthofthegreatartery, whichsufferthebloodtoflowfromtheheart, , canbeadequatelyclosedwithtwo, , Iwishsuchpersonstoobservethatthegrandarteryandthearterialveinareofmuchharderandfirmertexturethanthevenousarteryandthehollowvein; andthatthetwolastexpandbeforeenteringtheheart, andthereform, asitwere, twopouchesdenominatedtheauriclesoftheheart, whicharecomposedofasubstancesimilartothatoftheheartitself; andthatthereisalwaysmorewarmthintheheartthaninanyotherpartofthebody—andfinally, thatthisheatiscapableofcausinganydropofbloodthatpassesintothecavitiesrapidlytoexpandanddilate, justasallliquorsdowhenallowedtofalldropbydropintoahighlyheatedvessel.
