The Diagnosis from the Eye reveals the fact that glycerine, quinine, Resorcin and other poisonous antiseptics and stimulants absorbed from scalp cures and hair tonics and deposited in the brain are in many cases the real cause of chronic headaches, neuralgia, dizziness, roaring in the ears, loss of hearing and sight, mental depression, irritability and even insanity.
"Nature Cure"
Henry Lindlahr