A manual on palmistry, devoted not so much to fortune-telling on the hand as to the connection of palmistry with the rest of the occult sciences and its place in the series of hermetic sciences. The author of this book is one of the most prominent French hermetic philosophers and popularizers of occultism. The book was successfully reprinted in all languages ​ ​ and in all countries of the world and is still reprinted. The merit of Debarrol is not only that he attracted the attention of such prominent cultural figures as Balzac, A. Dumas the father, Victor Hugo, but also that for the first time he brought a solid theoretical base under his practical calculations.