bold = Main text
   Liber, Caput     grey = Comment text

 1     Pre         |        During the last three or four years I have read the Academica
 2     Pre         |        repeated revision during four years, it seems better to
 3     Int,      IV|       which he now divided into four books instead of two, making
 4     Int,      IV|      place, but Cicero left the four books in Atticus' power,
 5     Int,      IV|   authorised edition the one in four books. He did so in a passage
 6     Int,      IV|      the number of the books as four201. That he wished the work
 7     Int,      IV|     most frequently quoted. The four books are expressly referred
 8     Int,      IV|        were the contents of the four books. Book I.: the historico-philosophical
 9     Not,       1|        it is remarkable that in four passages where Cic. speaks
10     Not,       1|      The word is applied to the four elements themselves, N.D.
11     Not,       1|  history of the doctrine of the four elements may be gained from
12     Not,       1|       The Greeks would call the four elements στοιχεια but not
13     Not,       1|     Aristot., starting with the four necessary properties of
14     Not,       1|         passive, to each of the four elements; each therefore
15     Not,       2|       in holding that the whole four books formed one discussion,
16     Not,       2|    derivative from the word for four, be read? Petrilius and
17     Not,       2|   definition given by Sextus in four out of the six passages
18     Not,       2| question lies in a nutshell; of four propositions which prove
19     Not,       2|      asking whether two, three, four, etc. grains make a heap.