Caspar René Gregory published another cataloging system in 1908 in "Die griechischen Handschriften des Neuen Testaments", which is the system still in use today. Gregory divided the manuscripts into four groupings: papyri, uncials, minuscules, and lectionaries. This division is partially arbitrary. The first grouping is based on the physical material (papyrus) used in the manuscripts. The second two divisions are based on script: uncial and minuscule. The last grouping is based on content: lectionary. Most of the papyrus manuscripts and the lectionaries before the year 1000 are written in uncial script. There is some consistency in that the majority of the papyri are very early because parchment began to replace papyrus in the 4th century (although the latest papyri date to the 8th century). Similarly, the majority of the uncials date to before the 11th century, and the majority of the minuscules to after.