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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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C O M M R R C I U M
ray. That paper concained his reflections buc upon che tirst part oF your Lelter;
che cime noc permittine him co errice more chen. The nexE mornins he LVenCOut
ot Fonntor lome days; buc ac his recuen he encreaced ot me a second perutal ot
rour lecter, and broushu ic me back che nexemornins, cogecher wich che enclosea
Paper in ansiver co che second pare ot vours: wtrich he hach Framed as choush il
ivere a chird person chac WVrOtC IE, and hach desired me co conceal his name, lest
ic miphe be chouphe he made vanier et harine some excraordinary knoledes in
a Science chac he protessech co be very ionorant ol as havine never had any Ma
Per in ic, nor haring scarce Budred ie buc meeriy plaved ich ic tor His reCrCA
cion, and co Pacistie che provention othis Genius. Buc L chac protels candor anct
open dealins in erery chins and rich erery body, rrould noclet vou remain in
che dark in tnomins irtro is vour ancagonilt, since L have tnorlecse ot him:
erho choush he pals in his oin conceit tor a very Aighe Machemacieian; vet in
chac part oFic irhich concernech numbers, all FTANCC, eVeN MOnC. Roverbal and
Mont. Fermat, (and MonI. des Carses, irtien he as alire) do aetenomledse him
cheir Malter, and Superior co ehem ac à huse diltance. And chietly, tor chac Wrtrac
chey do rich much labour, and by mans circuies and operations, he doch imme.
diauls uxon che liehe ot che queltion, and richout any operacion, as chouon he
had an incuicire knomledse ot chose chines, and all his trouble is 1o sec ic donrn
in paper. Horrerer, Idehaced much rich my selt, Wrhecher or no L Mould send
rou chelecrro lalt papers: tor choush che exprections in chem be modest and sencle
in comparison ot Wrhac learned men in chele paris do irrice one against anocher
(as vou may sec in che dispures becween Gassendus and des Cartes, Morinus anc
Cassendus des Carres and Vermat, Fermat and Fienicle) vec me chintis ches
are cartet chan e ule in tensland, or chalt L’al lure L’Thould use in che like
cale, il L ivere oF a difterene opinion. Buc chac irtrieh mainty curned che scale
Wichme, was che considerins, chac il rou did noc sec irtrat chele persons lay 10
roy and consequendy Mhould make no reply co chem, cher mighe chink chey Hac
the berter ot our Nation, and Onivertier: Wrtrich L am lure vou vill tane acoue
Mhall noc be, irtien once ron tnou irhac is objected asaint yon. And belides, L
chouphe ic belonged co chac respect P oure and protels uneo rou, chac vou thoule
be acquainced rih Whacleerer L hear concernins vou.
Le tacetet e le peclimus 1omy perin irhien l am discourtins wich vou; le
much coment Lhare, in kcepins spresent 10 my choustus (0 excellent a perlon.
Buc L mult nocbe (o mueh a selt lorer, a5 10 delishe my selFac 100 preat a charse
ot jour Culterance and reargins. P Will cheretore crouble vou no lonser For chc
presene, buc killins vour hands do cate leare and rest.
Paris, 28 F ebr. 1638.
Pour most humble and
affectionate servant,
AFNF L. MF D16BL.
MonC. Lecte delires very much 10 sec whac Paristaction vou pive 10 che 110.
bleme jour sett propolcd: (Vide L. pist. 23, 29. ) chac ihen you may sec wtiac He
Caich cOII.
E P ISTOL A. XAVI
D. de Frenicle ad D. Kenelmum Dieby.
Cancio praecerire maluillem,  Mlustristime, cxrera quae in Fpistola ClacHLII
Dnallisii Mea uetes dileurienca supersune, quam in lingulis immorari; sec
cum a ide qule d hto teliciam expectes, non aquum ettuc desiderio uo detrau.
Exponic primum Fermaltas (uc haberur in E pillola W alsisii) Theorema quod.
deris.
Sequicur aliud problema Claristime Viri D. Fermac.
cat IS verbis.
Dato quovis numero non quadrato, dantur insinus quadrati, qui ut autuint nu
merum ductr adseica unitate consiciant quadratum. Vt exemplum praebee numeri
3, qui ductus in quacracos 1, vel 26, adseica unicace conticir quactca105 4, e 49; d
aNexIC
s