Sirera and Renn (2004)[33] distinguish two different types of expeditions, or voyages, during the period 1770-1830, which they term "the Romantic period”:
First are “expeditions financed by the States, closely related with the official scientific Institutions. characterized by having strict scientific objectives (and inspired by) the spirit of Illustration and progress”. In this type of expedition, Sirera and Renn include the following travellers:
* the British citizen Edens (1715) who ascends Mount Teide and publishes his story in Philosophical Transactions.
* Louis Feuillée (1724), who was sent to measure the meridian of El Hierro and to map the islands.
* Charles Borda (1771, 1776) who more accurately measured the longitudes of the islands and the height of Mount Teide
* the Baudin-Ledru expedition (1796) which aimed to recover a valuable collection of natural history objects.
The second type of expedition identified by Sirera and Renn is one that took place starting from more or less private initiatives. Among these, the key exponents were the following:
* Alexander von Humboldt (1799)
* von Buch-Smith
* Broussonet
* Webb
* Bertholet.
Sirera and Renn identify the period 1770-1830 as one in which “In a panorama dominated until that moment by France and England enters with strength and brio Germany of the Romantic period whose presence in the islands will increase”.
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