[26] The organ contains 66 stops, viz., 20 on the great organ, 12 on the choir, 5 on the solo, 17 on the swell, and 12 on the pedals. It has four separate rows of keys, with couplers, combination pedals, and complete pedal board. The instrument contains 4568 sounding-pipes. We must now cross over the Nave and enter the open court, which is close to the colossal Farnese Hercules, and which corresponds in position to the Canadian Court, which we examined before entering the Transept. This Court is filled with specimens of antique sculpture of the Greek and Roman schools. Among these we would draw attention to the colossal Velletri Pallas (351), so called from having been discovered at Velletri, near Rome, and now preserved in the Louvre, at Paris; the Dying Gladiator (309); a Boy with a Dolphin; a colossal head of Pallas (328). A Boy extracting a Thorn from his Foot, from the Capitoline Museum at Rome; and the fine head of Antoninus Pius (381). A collection of Greek ideal and portrait-busts will also be noticed in this Court; amongst which the colossal heads of Vespasian (332), Trajan (354), Pertinax (379), Lucius Verus (361), and Titus (333), are particularly deserving of notice. The visitor should not quit this compartment without noticing the collection of antique vases which it contains, amongst which the Medicean Vase (343) is a peculiarly elegant example of antique art. The elegant tripod (211), and the antique fountain (357), are also worthy of attention. Here also we find the celebrated group known as the Toro Farnese, or Farnese Bull. The original of this beautiful group, which is now preserved in the Museum at Naples, was discovered in the Baths of Caracalla at Rome, and derives its name from having been placed in the Farnese Palace in that city. The subject is the revenge of Queen Antiope and her two sons, Zethus and Amphion, on Dirce, for seducing the affections of her husband, Syeres, King of Thebes. The sons, enraged at the insult offered to their mother, are represented as about to revenge themselves by tying the unfortunate Dirce to the horns of a bull, when their mother, moved with womanly pity, intercedes for her rival, and induces them to forego the intended punishment. According to Pliny, the Toro Farnese was the work of the Rhodian artists, Apollonius and Tauriseus. Conspicuous also in this compartment, from its high position and great beauty, is the Choragic Monument of Lysicrates. This beautiful example of ancient Greek architecture is usually styled the Lantern of Demosthenes, on account of a tradition which ascribes its erection to that celebrated orator. No weight, however, can be attached to this supposition, although it may be, and in all probability is, due to the time of Demosthenes.