Felix Roberton’s Essay on Chorea Sancti Viti (June 5, 1805)

“I suppose there are but few individuals in the United States, who have not at least heard of the unparalleled blaze of enthusiastic religion which burst forth in the western country about the year 1800…. It was under these circumstances that some found themselves unable by voluntary efforts to suppress the contraction of their muscles….”

William Young’s “Thoughts on the Exercises” (February 20, 1806)

“I presume not to condemn the persons thus influenced [by the jerks], nor to detract from the sincerity of their devotion; but my wish is to remove the delusion of supposing it to be a bodily disease, and leave the intrinsic merits of the subject to Him, who “searcheth the hearts and trieth the reins of the children of men….”

Thomas Cleland’s Published Letter on “Bodily Affections” (ca. 1812–1824)

“The phenomenon of…suddenly falling or sinking down, under religious exercises, has not been uncommon in times of great excitement…. But the bodily agitation called the jerks is a very different affection….”