; ( 1559 ) 
SchUa^ no Explicaifons sdded to the Elements (being 
thought needlefs to a Book of Eiements, written with fo^ 
much Jodgnient as this is) nor any Notes, , except in foma- 
very few -placesj where there are. various Readings that 
are material^ or where the Text is manifcflly corrupted* 
Next come the D^/r^, which are undoubtedly EncIid^St 
yea, more uodciibtedly than the Elements themfclves. 
For many have faid that Theon did quite change the Ele- 
ments, and fopply their demonftraiions, but never any 
body queftiooed whether the Data are Euclid's. Dr Gr^- 
gor/'m the Preface compares this Book with Pappus's de- 
fcriptidn of it, reftores fome places in it that have been 
corrupted, and (hews the ufe that the Antients made of 
thdQ Data. 
The two M^r<?/ Tr^^x follow, which the Editor thinks 
are not both Euclid^ it may be neith^Tj as is fully fet 
forth in the Preface. 
Next are llncHd'% Ph(Bmmena ^ which were never be- 
fore publifhedr in Gree^^. Tbis Baok is not doubted tobv^ 
Euclid's^ it agreeing with P^/?/?^ s defcriptiori of it, Dr 
Gregory has reftored its own original figures, which Jofe-^- 
phtis Auria^ in his Tranflation, had changed for others far 
lefs convenient and intelligible. 
After this comes the Opticks and Catoptricf{s^ whichj if 
not fpurious Cfqr Fr&clm Indeed- mentions Books of Baiclid 
concerning there fubjeds) are very niHch corrupted> as in 
the Preface is folly fewn. , .To thefe ai-e added theiMot^s 
offtheNcjfck and >Leariie(fe ^ti'&Mry-Sdvilij^ TFonndoet of 
the two Mathematical Chairs in the Univeritty of Oxford^ 
which he wrote on the Margin of his own Book^ and which 
ihew that he was as great a Matter in Matheniaticks as he 
was a Patron of them. 
Next in order is the Book de Divifwmhm, This corr-^ 
monly goes under the name Machonutzs Bagdedlnm. 
But becaule there is no other Book-extant of Eu€ljd\\^\i\x 
this Title, akho it is clear from Fr^ch-s that he wrote fuch 
a 
