For this work M. De Dartein has made exact measured drawings from sixty-eight bridges, and each example has a great historic interest. The author has taken a line of his own, dwelling on the ornament of bridges, their decoration; several of his volumes are long overdue, but in his earnest study of the eighteenth century we see what he admires in French design. M. De Dartein is thoughtful and thorough, but I wish some photographs had been added to the illustrations, because measured drawings give only the dry bones of architecture. How to decorate a bridge is a question beset with so many problems, some practical, and others æsthetic, that it ought to be debated at an international congress of engineers and architects and artists. There are persons who think that M. De Dartein will say the last word on his important theme; but it is enough for me to believe that his material and his personal taste will be invaluable, presenting facts and provoking discussion. He lingers too often over details of trivial ornament, which increase the cost of production without doing any good at all to the architecture. In other words, M. De Dartein speaks too often as an engineer. The qualities of a great bridge should make their appeal in stern lines, in ample proportions, in a scale that befits not the site alone but the site and its history; for all fine architecture dwells with the fugitive generations as a lasting citizen; it is an epitome of racial character alembicated by genius. Bridges cannot be fine when they are dwarfed by their environments, or when they are too big to be in harmony with the externals of their setting. This, no doubt, is a staring truism, yet it is unseen by most modern engineers, whose metal monsters are often as wrongly placed in a gentle landscape as a giant from Brobdingnag would be at Lilliput. On the other hand, can you explain why the Roman bridge at Alcántara is tremendous art? Is it not because he is in scale with the rocky gorge of the Tagus? This virile bridge completes a grand site, and finds in the site his own completion. [Illustration: THE PONT NEUF AT PARIS, BUILT IN 1604; IT HAS BEEN MUCH ALTERED SINCE THE RENAISSANCE]