I have a copy of Bottesini's Method which was made by Carl Fischer. I've since talked with people at Fischer and they have no record of publishing the work, which isn't surprising since they have no *publication* records for string music prior to 1935-7. The telling part is that they have no record of obtaining copyright which means that it must have been published before 1906, which is when international copyright went into effect. My deduction is that, since Bottesini's Method was published in London, someone at Fischer decided to take it back here and reprint it, since there were no restrictions on doing such things.
That being said, the copy I have is probably as close to the original as I'll get in English. The exercise I have isn't in it, nor does it fit the structure of Bottesini's book. See, the exercise starts off showing ten different bowing variations (being primarily a bowing exercise that also happens to melodically take you through about six major keys and has you hit every note on the neck at least once), and technical bowing studies are in the Bottesini Method only once.
The page I have is definitely a photocopy of a print. At some point I'll even scan and include it. It has a page number (57) and an exercise number (44). I'm just slightly curious if it truly is attributed to Rossi, and if so, if there's more where it came from, because that one page has been the best warmup set I've ever seen. I'm aware of Rossi teaching Bottesini, and in fact this page, a certain looseness of bow grip and a resultant sound that is rich in harmonics are the full sum of my legacy as it stands. I'm just looking for more.
While I'm thinking of it, does anyone know a good source for antiquarian music books? The internet is still rather thin on the subject, especially when you know what you want...