the Greek Text of the Mathematical Collections of Pappus. 59 
non tan turn Pappi librum tertium cum sequentihus^ sed secun- 
dum etiam, non quidem integrum, sed ipsius partem non con- 
temnendum.” Halley likewise specifically says, in the preface to 
his edition of the Conics, singulis Apollonii libris Pappi Lem- 
mata prgefixa dedimus, e duobus codd. MSS. Savilianis desump- 
ta and these lemmata are all in the seventh book, comprising 
Prop. 165--SS4. of Commandine’s translation. Halley also pre- 
fixed to his edition of Apollonius de sectione rationis, the Greek 
text of the preface to the seventh book, pristinse integritati, 
quoad ejus fieri potuit, restitutum e duohus codd. MSS. Biblio- 
thecae Savilianae.” Now, these two works of Halley were pub- 
lished in 1710 and 1706, and the date of the catalogue is 1698 ; 
if, therefore, we had no other ground of argument, we could 
hardly imagine that he would have derived his authority with- 
out an}^ notice, from so recent a manuscript as that of the se- 
venth book must have been, if it had been inserted subsequent 
to Caswell’s publication. The several books, however, in No. 9. 
are not arranged in their natural order ; which, though not suf- 
ficient to account for the assertion of the defect, may have pre- 
vented the blunder from being immediately detected. In the 
beginning we have ‘‘ Pappi Alexandrini (rwotywyvi . . . Asm; ro 
xcct jj rov the first words of the text are ycc^ eivrcv? 
iXoio-a-cyet? iivcn ix.oc,TovWu?, which is the middle of the enunciation 
of the 15th proposition ; and then follows the end of the second 
book, as published by Dr Wallis. The other six books then 
come in the following order, 3, 7, 5, 6, 8, 4. The beginning 
of the 8th book is written on the back of the leaf, which con- 
tains the end of the 6th ; it is not therefore improbable that the 
MS. was originally copied from one which wanted the 7th and 
possibly the 4th book, and that these were afterwards supplied 
and misplaced ; but the whole is clearly of the same age, and 
written by the same persons. After a careful examination, 
there seem really not to be more than four or five ; but their se- 
veral hands are so mixed together, often two, and sometimes 
more, occurring in the same page, that there appears, at first 
sight, to be a larger number. The best of these writers execu- 
ted the greater part ; of his coadjutors one writes uvoiXXoyioiv 
and, although these blunders are generally corrected, 
and are, for the most part, confined to the beginning of his work. 
