Blue Mass

[RJNorton]

We were discussing blue mass in another thread. Dr. Norbert Hirschhorn researched the effect taking blue mass may have had on Abraham Lincoln. Hirschhorn states that Lincoln was known to have mood swings and angry outbursts. An example he gives is as follows:

Another incident recounted by Lamon's daughter supposedly occurred during one of the famous 1858 Senate debates between Lincoln and Stephen Douglas. In response to an accusation by Douglas about Lincoln's record in Congress, Lincoln furiously grabbed the collar of a former congressional colleague who, Lincoln said, knew the charge was false. While making his point, Lincoln shook the man "until his teeth chattered."

Is anyone familiar with this occurrence? It was new to me. I do not know its veracity.