is　the　circulation　of　the　blood。　Health　is　its　free　and　painless　circulation。　　Disease　is　an　abnormal　motion　of　the　blood；　either　general　or　local。　Like　the　English　school　generally；　he　is　far　more　exclusively　mechanical　than　are　the　Italians；　and　will　hear　nothing　of　ferments　or　acids；　even　in　digestion。　　This；　he　declares；　is　a　purely　mechanical　process　due　to　heat　and　pressure；　the　wonderful　effects　of　which　may　be　seen　in　Papin's　recently　invented　'digester。'　That　the　stomach　is　fully　able　to　comminute　the　food　may　be　proved　by　the　following　calculation。　Borelli　estimates　the　power　of　the　flexors　of　the　thumb　at　3720　pounds；　their　average　weight　being　122　grains。　Now；　the　average　weight　of　the　stomach　is　eight　ounces；　therefore　it　can　develop　a　force　of　117；088　pounds；　and　this　may　be　further　assisted　by　the　diaphragm　and　abdominal　muscles　the　power　of　which；　estimated　in　the　same　way；　equals　461；219　pounds！　Well　may　Pitcairne　add　that　this　force　is　not　inferior　to　that　of　any　millstone。〃＇36＇　Paracelsus　gave　an　extraordinary　stimulus　to　the　study　of　chemistry　and　more　than　anyone　else　he　put　the　old　alchemy　on　modern　lines。　　I　have　already　quoted　his　sane　remark　that　its　chief　service　is　in　seeking　remedies。　　But　there　is　another　side　to　this　question。　　If；　as　seems　fairly　certain；　the　Basil　Valentine　whose　writings　were　supposed　to　have　inspired　Paracelsus　was　a　hoax　and　his　works　were　made　up　in　great　part　from　the　writings　of　Paracelsus；　then　to　our　medical　Luther；　and　not　to　the　mythical　Benedictine　monk；　must　be　attributed　a　great　revival　in　the　search　for　the　Philosopher's　Stone；　for　the　Elixir　of　Life；　for　a　universal　medicine；　for　the　perpetuum　mobile　and　for　an　aurum　potabile。＇37＇　I　reproduce；　almost　at　random；　a　page　from　the　fifth　and　last　part　of　the　last　will　and　testament　of　Basil　Valentine　（London；　1657）；　from　which　you　may　judge　the　chemical　spirit　of　the　time。
  ＇36＇　Withington：　　Medical　History　from　the　Earliest　Times；　London；　1891；　Scientific　Press；　p。　317。
  ＇37＇　See　Professor　Stillman　on　the　Basil　Valentine　hoax；　Popular　Science　Monthly；　New　York；　1919；　LXXXI；　591…600。
  Out　of　the　mystic　doctrines　of　Paracelsus　arose　the　famous　〃Brothers　of　the　Rosy　Cross。〃　　〃The　brotherhood　was　possessed　of　the　deepest　knowledge　and　science；　the　transmutation　of　metals；　the　perpetuum　mobile　and　the　universal　medicine　were　among　their　secrets；　they　were　free　from　sickness　and　suffering　during　their　lifetime；　though　subject　finally　to　death。〃＇38＇
  ＇38＇　Ferguson：　　Bibliotheca　Chemica；　Vol。　II；　p。　290。　　For　an　account　of　Fludd　and　the　English　Rosicrucians　see　Craven's　Life　of　Fludd；　Kirkwall；　1902。
  A　school　of　a　more　rational　kind　followed　directly　upon　the　work　of　Paracelsus；　in　which　the　first　man　of　any　importance　was　Van　Helmont。　　The　Paracelsian　Archeus　was　the　presiding　spirit　in　living　creatures；　and　worked　through　special　local　ferments；　by　which　the　functions　of　the　organs　are　controlled。　　Disease　of　any　part　represents　a　strike　on　the　part　of　the　local　Archeus；　who　refuses　to　work。　Though　full　of　fanciful　ideas；　Van　Helmont　had　the　experimental　spirit　and　was　the　first　chemist　to　discover　the　diversity　of　gases。　Like　his　teacher；　he　was　in　revolt　against　the　faculty；　and　he　has　bitter　things　to　say　of　physicians。　　He　got　into　trouble　with　the　Church　about　the　magnetic　cure　of　wounds；　as　no　fewer　than　twenty…seven　propositions　incompatible　with　the　Catholic　faith　were　found　in　his　pamphlet　（Ferguson）。　The　Philosophus　per　ignem；　Toparcha　in　Merode；　Royenborch；　as　he　is　styled　in　certain　of　his　writings；　is　not　an　easy　man　to　tackle。　I　show　the　title…page　of　the　〃Ortus　Medicinae；〃　the　collection　of　his　works　by　his　son。　　As　with　the　pages　of　Paracelsus；　there　are　many　gems　to　be　dug　out。　The　counterblast　against　bleeding　was　a　useful　protest；　and　to　deny　in　toto　its　utility　in　fever　required　courage　a　quality　never　lacking　in　the　Father　of　Modern　Chemistry；　as　he　has　been　called。
  A　man　of　a　very　different　type；　a　learned　academic；　a　professor　of　European　renown；　was　Daniel　Sennert　of　Wittenberg；　the　first　to　introduce　the　systematic　teaching　of　chemistry　into　the　curriculum；　and　who　tried　to　harmonize　the　Galenists　and　Paracelsians。　　Franciscus　Sylvius；　a　disciple　of　Van　Helmont；　established　the　first　chemical　laboratory　in　Europe　at　Leyden；　and　to　him　is　due　the　introduction　of　modern　clinical　teaching。　In　1664　he　writes：　　〃I　have　led　my　pupils　by　the　hand　to　medical　practice；　using　a　method　unknown　at　Leyden；　or　perhaps　elsewhere；　i。e。；　taking　them　daily　to　visit　the　sick　at　the　public　hospital。　There　I　have　put　the　symptoms　of　disease　before　their　eyes；　have　let　them　hear　the　complaints　of　the　patients；　and　have　asked　them　their　opinions　as　to　the　causes　and　rational　treatment　of　each　case；　and　the　reasons　for　those　opinions。　Then　I　have　given　my　own　judgment　on　every　point。　Together　with　me　they　have　seen　the　happy　results　of　treatment　when　God　has　granted　to　our　cares　a　restoration　of　health；　or　they　have　assisted　in　examining　the　body　when　the　patient　has　paid　the　inevitable　tribute　to　death。〃＇39＇
  ＇39＇　Withington：　　Medical　History　from　the　Earliest　Times；　London；　1894；　pp。　312…313。
  Glauber；　Willis；　Mayow；　Lemery；　Agricola　and　Stahl　led　up　to　Robert　Boyle；　with　whom　modern　chemistry　may　be　said　to　begin。　Even　as　late　as　1716；　Lady　Mary　Wortley　Montagu　in　Vienna　found　that　all　had　transferred　their　superstitions　from　religion　to　chemistry；　〃scarcely　a　man　of　opulence　or　fashion　that　has　not　an　alchemist　in　his　service。〃　To　one　scientific　man　of　the　period　I　must　refer　as　the　author　of　the　first　scientific　book　published　in　England。　　Dryden　sings：
  Gilbert　shall　live　till　load…stones　cease　to　draw　　　Or　British　fleets　the　boundless　ocean　awe。
  And　the　verse　is　true；　for　by　the　publication　in　1600　of　the　〃De　Magnete〃　the　science　of　electricity　was　founded。　　William　Gilbert　was　a　fine　type　of　the　sixteenth…century　physician；　a　Colchester　man；　educated　at　St。　John's　College；　Cambridge。　　Silvanus　Thompson　says：　　〃He　is　beyond　question　rightfully　regarded　as　the　Father　of　Electric　Science。　　He　founded　the　entire　subject　of　Terrestrial　Magnetism。　　He　also　made　notable　contributions　to　Astronomy；　being　the　earliest　English　expounder　of　Copernicus。　In　an　age　given　over　to　metaphysical　obscurities　and　dogmatic　sophistry；　he　cultivated　the　method　of　experiment　and　of　reasoning　from　observation；　with　an　insight　and　success　which　entitles　him　to　be　regarded　as　the　father　of　the　inductive　method。　That　method；　so　often　accredited　to　Bacon；　Gilbert　was　practicing　years　before　him。〃＇40＇
  ＇40＇　Silvanus　P。　Thompson：　　Gilbert　of　Colchester；　Father　of　Electrical　Science；　London；　Chiswick　Press；　1903；　p。　3。
  CHAPTER　V
  THE　RISE　AND　DEVELOPMENT　OF　MODERN　MEDICINE
  THE　middle　of　the　seventeenth　century　saw　the　profession　thus　far　on　its　waycertain　objective　features　of　disease　were　known；　the　art　of　careful　observation　had　been　cultivated；　many　empirical　remedies　had　been　discovered；　the　coarser　structure　of　man's　body　had　been　well　worked　out；　and　a　good　beginning　had　been　made　in　the　knowledge　of　how　the　machinery　workednothing　more。　What　disease　really　was；　where　it　was；　how　it　was　caused；　had　not　even　begun　to　be　discussed　intelligently。
  An　empirical　discovery　of　the　first　importance　marks　the　middle　of　the　century。　　The　story　of　cinchona　is　of　special　interest；　as　it　was　the　first　great　specific　in　disease　to　be　discovered。　In　1638；　the　wife　of　the　Viceroy　of　Peru；　the　Countess　of　Chinchon；　lay　sick　of　an　intermittent　fever　in　the　Palace　of　Lima。　　A　friend　of　her　husband's；　who　had　become　acquainted　with　the　virtues；　in　fever；　of　the　bark　of　a　certain　tree；　sent　a　parcel　of　it　to　the　Viceroy；　and　the　remedy　administered　by　her　physician；　Don　Juan　del　Vego；　rapidly　effected　a　cure。　　In　1640；　the　Countess　returned　to　Spain；　bringing　with　her　a　supply　of　quina　bark；　which　thus　became　known　in　Europe　as　〃the　Countess's　Powder〃　（pulvis　Comitissae）。　A　little　later；　her　doctor　followed；　bringing　additional　quantities。　Later　in　the　century；　the　Jesuit　Fathers　sent　parcels　of　the　bark　to　Rome；　whence　it　was　distributed　to　the　priests　of　the　community　and　used　for　the　cure　of　ague；　hence　the　name　of　〃Jesuits'　bark。〃　Its　value　was　early　recognized　by　Sydenham　and　by　Locke。　　At　first　there　was　a　great　deal　of　opposition；　and　the　Protestants　did　not　like　it　because　of　its　introduction　by　the　Jesuits。　　The　famous　quack；　Robert　Talbor；　sold　the　secret　of　preparing　quinquina　to　Louis　XIV　in　1679　for　two　thousand　louis　d'or；　a　pension　and　a　title。　That　the　profession　was　divided　in　opinion　on　the　subject　was　probably　due　to　sophistication；　or　to　the　importation　of　other　and　inert　barks。　It　was　well　into　the　eighteenth　century　before　its　virtues　were　universally　acknowledged。　　The　tree　itself　was　not　described　until　1738；　and　Linnaeus　established　the　genus　〃Chinchona〃　in　honor　of　the　Countess。＇1＇
  ＇1＇　Clements　R。　Markham：　　Peruvian　Bark；　John　Murray；　London；　1880；　Memoir　of　the　Lady　Anna　di　Osoria；　Countess　of　Chinchona　and　Vice…Queen　of　Peru；　1874。
  A　step　in　advance　followed　the　objective　study　of　the　changes　wrought　in　the　body　by　disease。　　To　a　few　of　these　the　anatomists　had　already　called　attention。　　Ve