This book is a fascinating account of the author's astronomical observations during his stay on the island of Tenerife in the Canary Islands. Smyth vividly describes his experiences setting up his telescope and taking measurements of the stars, the moon, and other celestial bodies. He also provides a wealth of scientific information on astronomy and geology. This is an essential read for anyone interested in astronomy and the history of scientific exploration. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.