That’s precisely the poem that occurred to me, the infamous cacata charta of Catullus 36 (cf. 96). And this epigram of Martial’s is directly preceded by a laudatory one to Catullus. And/But Calvus—if it’s the same Calvus—was a buddy of Catullus (Cat.14, 53, 96). Whom Catullus joshes over a Saturnalia gift of bad poetry. And the books epigrammed by Martial in this book (bk.14, the αποφόρητα) are supposed also to be Saturnalia gifts. It’s complicated!
But what I like about it, of course, is the wickedly phrased conceit that the papyrus roll on which Calvus’ treatise on the use of cold water was written was better off in its original form as a papyrus plant growing in the waters of the Nile.
“the papyrus roll on which Calvus’ treatise on the use of cold water was written was better off in its original form as a papyrus plant growing in the waters of the Nile.”
That occurred to me too–the warm waters of the Nile.