This book is quantitative poetic metric analysis and pursuit of reasoning on aesthetics of linguistics and poetry in Indo-European languages. Although this book was published in 1974, it never got distributed to the public. Now available in digital form for scholars interested in the science of meter and its relation to poetry and languages. The book is written in French and it is a result of 41 years of research in pursuit of perfection for delivering a universal formula that defines beauty in spoken Indo-European words.