[The blueness of the Rhone, which has been attributed to various causes, is due to the comparative purity of the water. The yellow and muddy stream, during its passage through the lake, is enabled to purge itself to a very great extent of the solid matter held in suspension--the glacial and other detritus---and so, on leaving its vast natural filtering-bed, it flows out clear and blue: it has regained the proper colour of pure water.] 18. This hallowed, too, the memorable kiss. Stanza lxxix. line 3. This refers to the account, in his _Confessions_, of his passion for the Comtesse d'Houdetot (the mistress of St. Lambert), and his long walk every morning, for the sake of the single kiss which was the common salutation of French acquaintance. Rousseau's description of his feelings on this occasion may be considered as the most passionate, yet not impure, description and expression of love that ever kindled into words; which, after all, must be felt, from their very force, to be inadequate to the delineation; a painting can give no sufficient idea of the ocean. [Here is Rousseau's "passionate, yet not impure," description of his sensations: "J'ai dit qu'il y avoit loin de l'Hermitage à Eaubonne; je passois par les coteaux d'Andilly qui sont charmans. Je rêvois en marchant à celle que j'allois voir, à l'accueil caressant qu'elle me feroit, au baiser qui m'attendoit a mon arrivée. Ce seul baiser, ce baiser funeste avant même de le recevoir, m'embrasoit le sang à tel point, que ma tête se troubloit, un éblouissement m'aveugloit, mes genoux tremblants ne pouroient me soutenir; j'étois forcé de m'arréter, de m'asseoir; toute ma machine étoit dans un désordre inconcevable; j'étois prêt à m'évanouir.... A l'instant que je la voyois, tout étoit réparé; je ne sentois plus auprès d'elle que l'importunité d'une vigueur inépuisable et toujours inutile."--_Les Confessions_, Partie II. livre ix.; _Oeuvres Complètes de J.J. Rousseau_, 1837, i. 233. Byron's mother "would have it" that her son was like Rousseau, but he disclaimed the honour antithetically and with needless particularity (see his letter to Mrs. Byron, and a quotation from his _Detached Thoughts, Letters_, 1898, i. 192, note). There was another point of unlikeness, which he does not mention. Byron, on the passion of love, does not "make for morality," but he eschews nastiness. The loves of Don Juan and Haidée are chaste as snow compared with the unspeakable philanderings of the elderly Jean Jacques and the "mistress of St. Lambert."