444 
Proceedings of the Royal Society 
u Vetus Logica,” from the middle of the twelfth down to the 
beginning of the sixteenth century, meant the logic taught in the 
eurayoryr) of Porphyry, and in the wept Kar^yoptW and the wepl 
ipfirjve tas of Aristotle. 
“ Nova Logica,” during the same period, meant the logic of 
Aristotle’s avaXvTLKa rrpoTtpa, avaXvTLKa varepa, totuku and 7rept 
crocf) l(ttlku)v eAeyywi/. This is the almost invariable scholastic use of 
the terms. Any other is accidental and variable. 
Now, this assertion is made against the greatest authority in 
the history of scholastic Logic, Professor Prantl of Munich, whose 
“ G-eschichte der Logik im Abendlande,” is one of the most trust¬ 
worthy and laborious efforts in historical research. Dr Prantl 
recognises, as every one must do, that the meaning given here to 
“vetus” and “nova logica” was one of the principal scholastic 
uses of the terms, and every quotation to be made from logical 
treatises in support of our view of the question appears in his 
notes, hut he seems to think that the expressions retained their 
relation to the names “ Antiqui ” and “ Moderni,” and that any 
signification which belongs to them apart from these names is 
entirely subordinate. He connects the term “ Nova Logica ” with 
the partly grammatical, partly logical additions to the doctrine 
which first became popular through the Summube Logicales of 
Petrus Hispanus; * he makes it occupy the middle place between 
the “ old ” logic and the “ Ars Magna ” of Eaymond Sully; and 
he has proved by a quotation from a dialogue in that curious and 
amusing Manuale Scholarium or Medieval Students’ Guide-book, 
given in Zarnacke’s Deutschen Universitaten im Mittelalter, that 
when the Antiqui were hard pressed by the Moderni, they always 
retired on the “Yetus Logica” as their stronghold, f 
* Prantl believes that this addition to logic is due to a Byzantian influence, 
and therefore believes that the Summulae of Petrus Hispanus is almost a 
Latin translation from the Greek of Psellus. Sir W. Hamilton and many 
other authorities refuse to admit this Byzantian influence, and hold that the 
Greek work of Psellus is a copy or translation from the Latin of Petrus 
Hispanus. Prantl, Gesch. der Logibr.,\\. p. 264. Hamilton Discus. 2nded., 
p. 275. 
f C. iv. De altricatione viarum et disciplinarum. 
Camillus. Hunc magistrum tu quasi ad coelum attuliste tamen modernus 
est. 
Bartoldus. Quid turn ? 
