[30] The illuminating apparatus at Dungeness is one of what is termed the sixth order, 300 millimetres (about 12 inches) in diameter. Mr. Chance constructed one for Souter Point of the third order, one metre (nearly 40 inches) in diameter, with special arrangements for giving artificial divergence to the beam in a vertical direction, in order to obviate the danger arising from the luminous point not being always precisely in the same spot. It has also additional contrivances for utilizing the back light. Similar arrangements were made for the South Foreland lights, which are also of the third order; and every portion of the machinery and apparatus is in duplicate in case of accident, and the double force can be employed in times of fog. SUPPLEMENTARY PORTRAITS. It has been said that there is no photograph or painting of Faraday which is a satisfactory likeness; not because good portraits have never been published, but because they cannot give the varied and ever-shifting expression of his features. Similarly, I fear that the mental portraiture which I have attempted will fail to satisfy his intimate acquaintance. Yet, as one who never saw him in the flesh may gain a good idea of his personal appearance by comparing several pictures, so the reader may learn more of his intellectual and moral features by combining the several estimates which have been made by different minds. Earlier biographies have been already referred to, but my sketch may well be supplemented by an anonymous poem that appeared immediately after his death, and by the words of two of the most distinguished foreign philosophers--Messrs. De la Rive and Dumas. "Statesmen and soldiers, authors, artists,--still The topmost leaves fall off our English oak: Some in green summer's prime, some in the chill Of autumn-tide, some by late winter's stroke. "Another leaf has dropped on that sere heap-- One that hung highest; earliest to invite The golden kiss of morn, and last to keep The fire of eve--but still turned to the light. "No soldier's, statesman's, poet's, painter's name Was this, thro' which is drawn Death's last black line; But one of rarer, if not loftier fame-- A priest of Truth, who lived within her shrine. "A priest of Truth: his office to expound Earth's mysteries to all who willed to hear-- Who in the book of Science sought and found, With love, that knew all reverence, but no fear. "A priest, who prayed as well as ministered: Who grasped the faith he preached; and held it fast: Knowing the light he followed never stirred, Howe'er might drive the clouds thro' which it past. "And if Truth's priest, servant of Science too, Whose work was wrought for love and not for gain: Not one of those who serve but to ensue Their private profit: lordship to attain