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# Title: [Johannis Wallis S. T. D. Geometriae Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis] Johannis Wallis S. T. D. Geometriæ Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis (shelfmarks Leibn. Marg. 100:1/2, Stück 2; Leibn. Marg. 100:1/2)
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Edicoris primi PR A F ATIO.
Scus marini causa quam fuerit in Rbilosophia res abstrusae imaaeinis;
a quamque hominum mentes, etiam perspicacissimorum, dum ipsius ratio-
ainem reddere sunt aceressi, perplexas bactenus distinuerit; non est ut
multis exponam: Gratius utique opus facturus, si indicavero, Eypothesium om
nium hactenus excoeitatarum defectus, urcunque notabiles, sacaces tamen bujus
avi philosophos ab ulteriori adhue serurinio faciendo non deterruisse. Duos inter
cum insienis Mathematicus D. Johannes WV altiCius, (S. Theoloeiae Doctor, e Gco-
metriae apud Oxonienses Professor Savilianus,) senii sui, in promovenda vera
Philosophia admodum felieis, ductum secutus, studiorum suorum partem aliquam
in hoc posuerit; novamque saltem hujus Phaenomeni Expothesin, si non ipsissimam
rei causam, a communi Telluris Lunaeque Centro gravitatis petitam excoeitave
rit; quam e eoreeii aliquot eruditione Viri, ut rationi admodum consentaneam,
caleulis suis comprobarunt: Opporcunum duxi, ex Prelo hanc in publieum enit-
tere; quo e alii, harum rerum periti, commodius possint, e sedatis animis,
Conjecturam hanc (quippe ut talem exhibet Authoris modestia) examinare, sua-
que de hac sensa proferre, aut etiam quas inibi reperiunt difficultates exponere:
unde judicium rectius fieri possit (quod  Fraciatus ipse satis insinuat) num
rejicienda sit haec Fypothesis, an pro meritis comprobanda. Subjuneimus icitur
hanc illius FIrpothesin, prout eam ipse exposuerat, in sipistola, ad onorabilem Vi
rum D. Robercum Boyle, Oronii data, die 25 Aprilis 1666: 8 Societati RC.
Sia Londini, mox exhibita.
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