Vitruvius Pollio, I dieci libri dell?architettura, 1567

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                <p type="main">
                  <s id="s.001638">
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                  ra, nè macchia. </s>
                  <s id="s.001639">La pozzolana dà mirabile ſodezza alle opere fatte nell acque. </s>
                  <s id="s.001640">di queſta ne par­
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                  lerà Vitruuio piu ſotto.
                    <emph.end type="italics"/>
                  </s>
                </p>
              </subchap2>
              <subchap2>
                <p type="head">
                  <s id="s.001641">
                    <emph type="italics"/>
                  Dellacalce, & del modo d'impastarla. </s>
                  <s id="s.001642">Cap. V.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.001643">Hauendoſi chiaro quello che appartiene alla copia della arena, biſogna anche
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                  uſar diligenza, che la calce cotta ſia di pietra bianca, ouero di Selice, & quella
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                  che ſarà di piu denſo, & duro Selice, ſarà piu utilmente adoperata nelle muta
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                  ture: ma quella che ſi farà di ſpugnoſa, ſarà buona nelle intonicature. </s>
                  <s id="s.001644">Quan
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                  do la calce ſarà eſtinta, allhora ſi deue impaſtare la materia in queſto modo, che piglian­
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                  doſi arena di caua tre parti di quelle con una di calce ſi tempra: ſe di ſiume, o di mare, due
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                  parti di arena, & una di calce, & coſi giuſta uerrà la ragione della malta, & della t em­
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                  pra ſua. </s>
                  <s id="s.001645">& anche ſe nell'arene o di fiume, o di mare piſte ſeranno le ſpezzature di teſtole, &
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                  criuellate, la terza parte farà la paſta migliore. </s>
                  <s id="s.001646">Ma perche la calce riceuendo l'acqua, &
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                  l'arena faccia piu ſoda la muratura, queſta pare, che ſia la ragione. </s>
                  <s id="s.001647">perche i ſaſsi, come
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                  gli altri corpi, ſono compoſti di elementi, & quelli, che nella loro miſtura hanno piu
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                  dello aere, ſono teneri, quelli, che abondano d'acqua ſono lenti, per l'humore, quelli,
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                  che hanno piu della terra ſono duri, & quelli doue predomina il fuoco, ſono fragili. </s>
                  <s id="s.001648">&
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                  però di queſti corpi, ſe i ſa ſsi, prima che ſiano cotti, piſtati minutamente, & con l'arena
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                  impaſtati, ſaranno poſti in opera, nè ſi faranno ſodi, nè potranno tenere unita la fabric
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                  ca. </s>
                  <s id="s.001649">Ma quando gettati nella fornace preſi dal gran feruore del fuoco, haueranno perduto
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                  la uirtu della loro ſodezza, allhora abbruciate, & conſumate le forze loro, reſtano con
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                  buchi, & fori aperti, & uoti. </s>
                  <s id="s.001650">Il liquore adunque, che è nel corpo di quella pietra, & lo
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                  aere eſſendo conſumato, o leuato, hauendo in ſe aſcoſo il reſtante del calore, poſto che
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                  è nell'acqua, prima che'l fuoco eſca fuori, ricouera la forza, & penetrando l'humore nel
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                  la rarità de i fori, bolle, & coſi raffreddato manda fuori del corpo della calce quel feruo
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                  rc: & però i ſaſsi tratti della fornace non riſpondeno al loro primo peſo: & benche hab­
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                  biano la iſteſſa grandezza, pure poſcia che è aſciutto il liquore, ſi trouano mancare della
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                  terza parte del peſo. </s>
                  <s id="s.001651">Eſſendo adunque i buchi loro aperti, & rari pigliano la meſcolan­
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                  za dell'arena, & ſi accompagnano, & ſeccandoſi con le pietre ſi raunano, & ferma fan­
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                  no la muratura. </s>
                </p>
                <p type="main">
                  <s id="s.001652">
                    <emph type="italics"/>
                  Nel preſente luogo ſi tratta della calce, la natura, la materia, & la comparatione della ma
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                  teria, di che ſi fa la calce. </s>
                  <s id="s.001653">Ogni pietra purgata da humori, ſecca, frale, & che non habbia co
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                  ſa da eſſer conſumata dal fuoco, è buona per far la calce. </s>
                  <s id="s.001654">Gli Architetti antichi lodauano la
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                  calce fatta di pietra duriſſima, ſpeſſa, & candida. </s>
                  <s id="s.001655">Vitruuio loda la Selice: benche altri dica,
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                  che ogni pietra da calce cauata ſia migliore della raccolta; & di ombroſa, & humida ca­
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                  ua piu toſto, che di ſecca; & di bianca, meglio che di bruna. </s>
                  <s id="s.001656">Quella calce, che è fatta di
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                  Macigni è di natura graſſa, ſe non ha ſale, & è piu ammaßata, & limata getta polue. </s>
                  <s id="s.001657">La
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                  calce ſi cuoce in hore ſeſſanta: & la piu lodata deue reſtare il terzo piu liggiera della ſua pietra. </s>
                  <s id="s.001658">
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                  Ma è coſa mirabile del boglimento, che ella fa, quando ſi le getta l'acqua di ſopra. </s>
                  <s id="s.001659">Egli ſi
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                  legge in ſanto. </s>
                  <s id="s.001660">Agoſtino al quarto Capo del uenteſimo primo libro della Città di Dio, queſto
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                  bello ſentimento. </s>
                  <s id="s.001661">La calce concepe il fuoco dal fuoco. </s>
                  <s id="s.001662">& eſſendo la zolla fredda immerſa nel
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                  l'acqua, ſerua il fuoco naſcoſo, di modo, che egli a niun ſenſo è manifeſto. </s>
                  <s id="s.001663">ma però ſi ha per
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                  iſperienza, che ſe bene il fuoco non appare, ſi ſa però, che egli ui è dentro; per il che chia
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                  mamo quella calce uiua: come, che il fuoco naſcoſo ſia l'anima inuiſibile di quel corpo uiſibi
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                  le: ma quanto è mirabile, che mentre ella ſi eſtingue piu ſi accenda? </s>
                  <s id="s.001664">& per leuarle, il fuo
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                  co occulto ſe le infonda l'acqua? </s>
                  <s id="s.001665">& eſſendo prima fredda, poi bolle da quella coſa, di doue tut-
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                  </s>
                </p>
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