We're almost at the end of this book, and in Caprice number 38, Campagnoli takes his hat off to Rodolphe Kreutzer and his 42 Etudes for Violin (1796), by quoting Etude #2. And guess where it happens: at measures 41-42. Is this a coincidence of numbers? Knowing how deliberate Camapagnoli was, I think probably not. We don't know about the two composers' relationship, but it is very likely that they knew each other, and obvious that there was admiration. This all but confirms my theory that Campagnoli held the great Kreutzer in such regard that he wrote 41 caprices, one less than his contemporary.
Many of Campagnoli's caprices have a strong focus on bowing. However, Caprice 37 is all about the left hand. And wow - did my left hand feel like it was going to fall off after recording this piece. (even though I was in great shape!)
Having said that, it was very important to let my bow arm drive the momentum as much as possible. Almost all of our expression comes from the bow, which we sometimes forget when presented with notey pieces like this one. But it can actually influence how the left hand works in both positive and negative ways.