Note from Vol. 1 Introduction, p. (10):

[Short lacunae are indicated in the translation by dots, and longer gaps by asterisks, but in neither case is the number of the dots or asterisks intended to bear any exact relation to the number of the missing words. In respect to this an approximately correct inference may be drawn by consulting the Syriac text.

Double inverted commas mark quotations where the original has [Syriac]

Single inverted commas are used in numerous cases where the words seem to be quotations or to belong to a special terminology.

Words in italics inside square brackets are to be regarded as conjectural translations or paraphrases.

In a few passages, where the text has suffered great mutilation, italics indicate an attempt to summarise the argument from suggestions in the fragments.]

[P.101] indicates page 101 of the accompanying Syriac.  [l.2] means line 2 of the current page of the accompanying Syriac.  [RP]