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28
ChapterI
QuestionIVonlocalmotion:Canlocalmotionbemeasuredthrough
acertainspeed?(Utruminmotulocalisitcertaservandavelocitas).Tothis
questionbelongthefollowingarticles:1)Istheaccelerationofaheavy
bodycausedbyaspecifcfactor?(Utrumvelocitatiomotusgravissitabali-
quacausacerta);2)Isthespeedofaspheremovingintimemeasuredby
apointonlyorbyaspace?(Utrumvelocitasmotussphaeraecuiuslibetpenes
punctumtantumvelspaciumaliquodattendatur);3)Isaccelerationofanyuni-
formlydifformlocalmotion,startingfromnon-degree,equaltoitsmid-
dledegree?(Utrumvelocitasomnismotuslocalisuniformiterdifformisincipiens
anongradusitaequalissuomediogradui).
Thefrstquestiondealswiththemotionofgeneration.Itsauthoris
oftheopinionthatthespeedofmotionintheprocessofgeneration-
understoodastheprocessoftransition,forexample,fromcoldnessto
hotnessorfromalessintensehotnesstoamoreintenseone,orthepro-
cessofthegenerationofoneelementfromanother,whentwoqualities
arechangedsimultaneously,e.g.,hotnessanddrynessintocoldnessand
wetness-shouldbemeasuredbythelatitudeoftheacquiredform,that
is,inmodernterms,bythecertainamountofthequalitygained.Inthe
secondmainquestiondealingwiththespeedofthemotionofaltera-
tion,theauthoralsoconcludesthatthespeedisproportionaltotheratio
ofthelatitudeofqualitygainedtothepreviouslatitudeofquality.As
forthethirdmainquestiononaugmentation,theauthorclaimsthatthe
speedofsuchachangeisrightlymeasuredbytheratioofthelatitudes
ofrarefactionanditisdeterminedbytheratioofthelengthstraversed
bythefastestmovingpointorpoints.50
TheruleforlocalmotionwillbediscussedindetailinChapterIII
below.ThecompletetextofquestionIVonlocalmotionisbefound
inthefollowingmanuscripts:Paris,BnFlat.,6559;Paris,BnFlat.6527;
Venezia,BibliotecaMarciana,lat.VIII.19;Oxford,BodleianLibrary,
Canon.Misc.177,andinanoldprintBonetusLocatellusandprintedin
Venicein1505.51
50SeeS.Rommevaux-Tani,Ladéterminationdelarapiditéd)augmentation...,pp.153-
162;E.Jung,uZmianyilościoweiichmiara…”,p.39.
51Theoldprintisfulloferrorsandomissions.BesidesthefourquestionsofDesex
inconvenientibusthecollectioncontains:QuaestiodemodalibusBassaniPoliti;Tracta-
tusproportionumintroductoriusadcalculationesSuisset;TractatusproportionumThomae
Braduardini;TractatusproportionumNicholaiOrem;Tractatusdelatitudinibusforma-
rumeiusdemNicholai;TractatusdelatitudinibusformarumBlasiideParma;Quaestio