This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
These substances produce local anaesthesia by evaporation. They are rubefacient if their vapor is confined. The stomach, heart and central nervous system are first stimulated and then depressed by them. Amylic Alcohol, (B. P.) Ethyl Bromide, Bromoform and Pental, none of which are official, are considered in this class.