Ditto with rack-work motions, improved mountings and metals 39 18 Two feet long without rack-work, and with 4 magnifying powers, improved 15 15 Ditto improved, with rack-work motions 22 1 Eighteen inch, on a plain stand 9 9 Twelve inch ditto 6 6 2. Prices as stated by Messrs. Tulley, Islington. £ s. 1 foot Gregorian Reflector, on pillar-and-claw stand, metal 2-1/2 inches diameter, packed in a mahogany box 6 6 1-1/2 foot ditto on pillar and claw stand, metal 3 inches diameter, packed in a mahogany box 11 11 2 feet ditto, metal 4 inches diameter 16 16 Ditto with rack-work motions 25 4 3 feet ditto, metal 5 inches diameter, rack-work motions 42 0 4 feet ditto, metal 7 inches diameter, on a tripod stand with centre of gravity motion 105 0 6 feet ditto, metal 9 inches diameter 210 0 7 feet _Newtonian_, 6 inches aperture 105 0 12 feet ditto, metal 12 inches diameter 525 0 3. Prices stated by Mr. G. Dollond, St. Paul’s Church Yard. £ s. Reflecting telescopes 14 inches long, in a mahogany box 9 9 Ditto, 18 inches 12 12 Ditto 2 feet 18 18 Ditto with 4 different powers, and rack-work stand supporting the telescope in the centre of gravity 36 15 Ditto 3 feet, with ditto 50 0 4. Prices of single speculums and reflecting telescopes, as made by Mr. Grub, Charlemont Bridge works, Dublin.