Young dragon trees (Dracaena draco) near Orotava, Tenerife

Photographed by Charles Piazzi Smith (1819 - 1900), astronomer. Printed by A J Melhuish under the superintendence of James Glaisher FRS and published by Lovell Reeve. From ‘Teneriffe, an astronomer’s experiment: or specialities of a residence above the clouds’. This was the first published book to be illustrated with stereographs, pairs of photographs designed to be viewed in three-dimensions using a viewer called a stereoscope.