The cost of this fine instrument, which had been ordered by the King of Spain as long before as January, 1796, was £3150. The Prince of Canino paid £2310 for a ten and a seven-foot telescope from the same indefatigable hands. But although the pecuniary profit was great, it is not surprising that Miss Herschel should bemoan the “making and selling of telescopes” as unworthy of the enormous amount of time and labour which must be withdrawn from the study of astronomy; and it is evident that the fatigue and exhaustion from polishing mirrors told seriously upon Sir William’s health. Footnote 24: A characteristic little note from her brother belongs to this time: “Lina,—Last night I ‘popt’ upon a comet. It is visible to the naked eye, between Fomalhout and β Ceti, but above the line that joins the two stars. It made an equilateral triangle (downwards) with 100 and 107 Aquarii. I wrote last night to Sir J. Banks and write now also to Dr. Maskelyne. Adieu. _Dec. 9, 1805._” Footnote 25: De Luc was a geologist of high reputation; an ardent opponent of Huttonian views. Footnote 26: The following notice is from a Bristol paper: “Died, March 15th, 1821, at Hanover, Alexander Herschel, Esq., well-known to the public of Bath and Bristol as a performer and elegant musician; and, who for forty-seven years was the admiration of the frequenters of concerts and theatres of both those cities, as principal violoncello. “To the extraordinary merits of Mr. Herschel was united considerable acquirement in the superior branches of mechanics and philosophy, and his affinity to his brother, Sir William Herschel, the illustrous astronomer, was not less in science than blood. To a large circle of professional friends the uniform gentlemanly manners of Mr. Herschel have rendered him at once an object of their warmest regard and respect.” Alexander Herschel returned to Hanover in September, 1816, and was enabled to live in comfortable independence until his death at the age of seventy-six, through the never failing generosity of his elder brother. Footnote 27: Although Miss Herschel was endowed by nature with a fine healthy constitution, she suffered much in various ways during the last twenty-five years of her life; and there is little doubt that her health was injured, to a considerable extent, by the excessive fatigue and serious accidents to which she was exposed in her earlier days, when she often denied herself rest that was imperatively needed, in order to be at hand when her brother required her services. Footnote 28: A younger sister of Mrs. Beckwith, niece of Lady Herschel. Footnote 29: This passage is a later note, added Sept. 26, 1828. Footnote 30: At this time W. Herschel frequently gave thirty-five and thirty-eight lessons a week to lady pupils. Footnote 31: