The primary reference is Am. This book in the same section has the description of whippings and its use in slave life. The author Randolph B. Campbell is a professor at the University of North Texas. The book is published by the Louisiana State University Press, Baton Rouge 70893 and is available in paperback. I enclose this text to let the reader know what it would be like to be whipped and then have salt put in the wound.
Whipping is painful enough.
Imagine the burning of salt in an open raw wound, it must have been like the fires of hell.