Note 86 — Chapter IV
Reading edition
In this region the temperate zone, botanically speaking, would extend from 5000 feet to the summit. In more northerly mountains, Etna for instance, the zones are usually reckoned to be five, viz. lowland or cultivated, wooded, shrubby, grassy, and of cryptogams. For sanitarial purposes the torrid would extend from the shore to 1500 feet above sea-level, the temperate from 1500 to 7000 feet, and the frigid to the top.