A spectacular book – it is based on Lowell's extensive study of Mars. It contains several of his interesting discoveries and theories including the one about intelligent life on Mars. A must-read, especially for readers fascinated by astronomy.
Lowell's work itself is beyond reviewing as it belongs to such a different era that it is very difficult for me to judge it with a clear mind, so this review is more about the particular paperback edition I've been reading, published by The Perfect Library in 2015, which is completely devoid of illustrations and thus lacking very important material that is referred to across the text. As the copyright has expired, it's better to look for the text online.