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# Title: [Johannis Wallis S. T. D. Geometriae Professoris Saviliani, in Celeberrima Academia Oxoniensi; Opera Mathematica] Johannis Wallis S. T. D. Geometriæ Professoris Saviliani, in Celeberrima Academia Oxoniensi; Opera Mathematica (shelfmarks Leibn. Marg. 100:1/2, Stück 1; Leibn. Marg. 100:1/2)
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Praxis
DE REGULA A Cap. XXYIX.
Simplices.
3. 20:: 12. 9= 80.
4. 9 =- 80: : 6. 9 = +20.
Tocius procestus racio, ex d lacs palet; cum non aliud sic quam operatio sim.
Plex bis peracta; nec nora indigebir demonltratione.
Ouod antem Binis Aurea Regulae operacionibus jam peractum cl, Pot est id
altera. ipsum una operatione composita peraei: Si nempe uiriusque analoeiae simplieis
primi termini invicem ducti, habeantur pro termino primo analoeiae compositae:
e similiter simplicium termini terrii, invicem ducti, pro tertio composita: ter-
minus aurem alter, quaesito homoloeus, pro secundo.
Verbigracia; in exemplo prius expotico: Si 4 viri, 3 mensibus, ependant l
bras 20; 6 viri, I2 mensibus, expendent quot libras 
Pro cermino primo; analosix CompOtia, (uMatuE 12 = 4 X3, (nempe qui til
ex numero virorum primorum in numerum primorum mentium ducto;) pro
certio, 72 =6X T2, (quitic ex numero secundorum virorum, in numerum fuo-
rum mentium ducto: ) Dro sccundo aurem, 20, numerus nempe librarum, hoc
est, cerminus quaesito homologus. AdCOGUC LOLS procellus lic conctabic
Compolita.
5. 20:: T2
+. 20:: 6
2. 0
22 . 20:: 72.  - 2L0.
20
2t) 14AdCLtad
Similicer in Symbolis: Si personiae P, tempore T, expendant libras L, persona
X tempore r, expendent quot putan, numerum quaelitum. Dico exit UE P F
PY) XTXL (N. Procelsus hic exit.
F) XrXL C
) ad L; lic Xr (= XX2) Al A, HUMEFII qUXLICM. Nempe
Ejusdem Operationis hujus compotitxe Ratio, sire Demonstratio, dependet ab ejuldem
demon. Cuu Placedenre conrenientia. Cum enim ut suxra oltentum cA, Analosia com
prant. Polica, relolricur in binas simplices
L::
F. L: : X: 9.
.
Erit primo 4=
demonstrandum.
AaCoque 2, a.
TX X L1
2 aL
l
quod crat
Rodem plane modo statuendum est, si exponatur Analogia etiam adtue maois
compolica. Puta Si trabis lienea, cujus loneitudo, pedum 4 =A; laticudo, pedum
 =B; alsitudo, pedum 2 = C: pondus sit librarum 240 = D; trabs alià lonea
pedes 10 = eiu lata, pedes 4 = 6; alta, pedem 2 = Y; quanti erit ponderis?
(puca, librarum S.) DicO, UE AXBXC, ad D; SCaxBX7, ad 5, =
10X472 =40
47. 3X2= 2.4
simplices.
B.
ABC D. HOC
x240 = 400. Ouod paree, relolura anaos compolica, in tres
10b1
icom
mulei
Teri