If this- had been well obferved 9 * Tfof. Quadrants > f>M»fti , «wy w f ; 
there had been no need of Contro- conveniently be ptftti on Copper- pi at e ?5 
'• ± \uu^u « rr • . ;/ and varmmt i which done, they win be'- 
verting Whether the Honzontall mt onl ^ , n4 (*. £ 
Projection had been a iY«* Inventi- « j 0 hn Marks *t the sign of the 
on: It is as Ancient as Vtolomy, and Golden Bail nearSomerfec-Houie) but al- 
oft the 4 Quadrants of feverai COntri- 1° ferviceable enough, being prcferv'd b/ 
vances published by Mr. fohn Collins*, f/ZfnT the ff d T( l in ' tt J its ?f 
j 'Ac L a ca Inland Dm, and for thefe very can e* 
are denved from the mfiern fide , or made pubUck , [ervi ^ g ExJlmple ' t0 
the continuance thereof, admitting introduce the Ufa way for other Matke - 
but a meer Mutation of the Names of mtmlinfirumenu. 
Circles , and a projecting of more Parallels. 
4. Of Catcftrickj 3 Books • in the Fir ft of -which the Author treats 0? 
Catcptricks or Refietlion. 
In the Second, of the affections of Pto Glaffes fimply , or of manyTuch"^ 
pkced either in a Parallel or Inclined Pofition to each other. 
In the Third , of Curved Glaffes, ' and therein firfl: the -chief affections of 1 
Convex Sphaerick Glaffes ; afterwards of Concave Sphserkk Giaffes : laftly 
of Burning Glaffes of feverai kinds. 
The death of the Author prevented him from Writing of the Dioptricks 
which w?s very far advanced by Des Chart es , and hath been further pro- 
moted fince by Be Beaune , Honor ato Fabri , Afanzini , and in the Centu- 
ry of Optick ProbLems of Efchwardus , and we may hope that ere long th£ 
learned Mr. Barrow will enrich the W orld with his Labours of this and ci- 
ther kinds • alfo Mr. fames Gregorie, the- Author of Optica Fromota^xh i 
Treatife of this Subject in goodforwardnefs for the Prefs, 
5. Follows the Auchors Treatife of Military Architecture* or Fortifier 
t'm-y in which he hath collected fix- feverai ways of Regular Fortification^, 
and hath likewife divers ways for Irregular ones,, when the Scituation of the 
place fo requires; and interfperfeth divers quefKons,and relates iorae-Tranf- 
actions in the late eminent Sieges of Chriltendome. 
6. ? Follow his Anmdaria & Cylindrlca •, the firft 4 Books -whereof were 
firft publiftit in .165.1, and are common enough to be had here • which 
may make the Reader wonder at their being reprinted 5 efpeciaily confider- 
Ing, that though they have defer vsdly received much applaufe yet they 
have likewife been cenfur'd tor oppofing and neglecting other Methods*, 
whereby the Author might have rendred, what he delivers, more univer- 
sally and briefly. Concerning the iarft 4 Books,. Ant. Lalovera in his Book 
de Geometr. veterum promota tiius ; 
Seroveneruntin manus noftras R\ P. Tacqueti ttP. 4. Cylindricorum & Afl- 
nularium : Opus cenfemus abfoluiifsimum , ejufcf; Authori, qui primus hac 
de re (uas lucubration es vulgavttjftam coronam debit am ejfe agnofcimus. 
And Stephen Angelfm his Treatife de Infinitis Farabolis r deque Inftnith Si* 
Skt^Mu (primed at Venice 165 in the Preface begins thusj 
V ' utile i, 
