"The famous astronomer Jean Mascart of the Paris Observatory came to Tenerife in 1910 along with other scientists to carry out various studies, including the observation of Halley's comet. Planetary and zodiacal light observations were also made on the occasion of this visit. Mascart expressed in this book his experiences and, especially, his singular perception of an island that astonished him for its exceptionality. All this led him to organize an observatory in Guajara Mountain, which would have been the first international observatory in the Canary Islands, but his intention was truncated by the beginning of the First World War."