IN writing a few words as Preface to a new issue of helionde, I confess to a feeling of pleasure and regret, -pleasure, when I acknowledge the cordial reception accorded to my work by the English journals, and the kind and ?attering remarks of the Revue, des Dean M ondes, Â regret, that I cannot avail myself, by reason of their abundance, of the valuable suggestions which have been made to me since the first'edition was published.