This is a pre-1923 historical reproduction that was curated for quality. Quality assurance was conducted on each of these books in an attempt to remove books with imperfections introduced by the digitization process. Though we have made best efforts - the books may have occasional errors that do not impede the reading experience. We believe this work is culturally important and have elected to bring the book back into print as part of our continuing commitment to the preservation of printed works worldwide.

About the Author

William Tyler Olcott (1873 – 1936) was an American lawyer and amateur astronomer. In 1909, he developed an interest in observing variable stars. In 1911, he founded the American Association of Variable Star Observers (AAVSO). He also published several books to popularize the field of amateur astronomy.

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