Yes, both original Latin passages from Marcus Terentius Varro's De Lingua Latina (Book VI) where he cites the Roman grammarian and legal scholar Cosconius are available below: [1, 2, 3]

Varro, De Lingua Latina, VI. 36

In this section, Varro cites Cosconius regarding the baseline number of "primitive" or root words (around 1,000) from which all other Latin words are derived and inflected: [1, 2, 3]

"Cum verborum declinatuum genera sint quattuor [...] horum verborum si primigenia sunt ad mille, ut Cosconius scribit, ex eorum declinationibus verborum discrimina quingenta milia esse possunt..." [1]

Varro, De Lingua Latina, VI. 89

In this section, Varro cites from Cosconius's Actiones regarding the duties of a magistrate's assistant (accensus) in calling out the hours: [1, 2]

"Hoc idem Cosconius in Actionibus scribit, praetorem accensum solitum esse iubere, ubi ei videbatur horam esse tertiam, inclamare horam esse tertiam, itemque meridiem, et horam nonam."[1, 2]

The full Latin texts can be found in the referenced documents. If you need the English translations or an etymological analysis of the specific grammatical terms Varro uses in these sections, please let me know! [1, 2, 3]