The new rule in relation to pitching prohibits the high underhand throwing of last season. It says: "The ball must be delivered to the bat with the arm swinging nearly perpendicular to the side of the body, and the hand swinging forward shall not be raised above the hip..."
The new pitching rule excludes such pitchers as J. Blong of the Red Sox, Chambers of the Empires and many others.
-St. Louis Republican, April 11, 1875
But this report from the Republican tells us something about Joe Blong, the pitcher. It gives us a little detail about what he was like on the field and how he delivered the ball. I'm not exactly certain but I read this as saying that Blong was not constrained by the new rule, for whatever reason, and was allowed to deliver the ball in an unorthodox manner.
Given my ignorance of the rules, however, I could be wrong about this.