mentary of Eutocius, (formerly extant in Greek, but 
now publiftied in Greek and Latine) partly, as a Specie 
wen of the Method which the Greek Commentators 
were wont to ufe for explaining of more ancient Au- 
thors ; partly to illuftrate that of ArchitneJes^ whole 
Demonftrations were very brief, and his Calculations 
onl}' pointed at ; which Eutocius hathadually performed; 
And chiefly, to Ihew how troublefome it was (at tha t 
time) to perform the Arithmetical Operations of Divifi* 
on and Extradion of Roots, (and other intricate Opera* 
tions) before the Introdadlion of the Indian Algorifm^ 
(or Calculation by the Nuwerai Figures now in ufe) of 
which Archimedes^ in his Arenarius, gives us the true 
Foundation, as to the Oeconomy of Numbers, but with- 
out the Notation now in ufe. 
After thefe Pieces of Archimedes and Eutocius^ in 
Greek and Latine, (with neceflary Notes) follows a 
Treatife of Ariftarchus Samius^ (De Magnitudinifus & 
Diftantiis Soli s & Luna) firft publilhed by Dr. Wallis 
(out of fome Manufcript Copies) in the Year 1688, (and 
now reprinted) with the Latine Tranflation of Common" 
dinus; and with the Annotations of CommandinjB^ and 
of his own. . ^ 
To this was then fubjoined (and is now reprinted) in 
Greek and Latine, a Fragment of the Second Book of Pap'^ 
pus A/exandrinus's Mathematick Colledions. The La- 
tine Tranjlation of which Author, publiftied by Com- 
fnandinus ^ (tht Greek^ being not yet *publiflied by any, 
but whereof there are^n Oxford fome M. S. Copies) be- 
gins at the Third Book (the two former being wanting.) 
But a good part of the Second Book (being extant at Ox- 
ford^ in one Greek Manufcript^ is now publilhed in Greek 
and Latine ; Whereby we may judge of the Contents 
of what is loft; and that the Lofs is not great as gi- 
ving an Account of the Arithmetical Operations then in 
