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South of the Mare Vaporum are found some of the most notable of those strange lunar features that are called "clefts" or "rills." Two crater mountains, in particular, are connected with them, Ariadæus at the eastern edge of the Mare Tranquilitatis and Hyginus on the southern border of the Mare Vaporum.
On reaching the E. wall, it turns somewhat more to the N., becomes still coarser and more irregular in breadth, and ultimately expands into a wide valley on the N.E. It is connected with the Ariadaeus cleft by a branch which leaves the latter at an acute angle on the plain E. of Silberschlag, and joins it about midway between its origin N. of Agrippa and Hyginus.
Though, as a rule, invisible at full moon, some of the coarser clefts as, for example, a portion of the Hyginus furrow, and that north of Birt may be traced as delicate white lines under a nearly vertical light.
Hyginus was also one of the earliest commentators on Virgil; he possessed among his treasures a manuscript of the Georgics, which came from Virgil's own house, though it was not actually written by his hand; and many of his annotations and criticisms on the Aeneid are preserved by Aulus Gellius and later commentators.
The most noteworthy examples of these objects are in the following positions: West of a prominent ridge running from Beaumont to the west side of Theophilus, and about midway between these formations; in the Mare Vaporum, south of Hyginus; on the floor of Werner, near the foot of the north wall; under the east wall of Alphonsus, on the dusky patch in the interior; on the south side of the floor of Atlas.
It is also probably joined to the Triesnecker system by one or more branches E. of Hyginus. On May 27, 1877, Dr. Hermann Klein of Cologne discovered, with a 5 1/2 inch Plosel dialyte telescope, a dark apparent depression without a rim in the Mare Vaporum, a few miles N.W. of Hyginus, which, from twelve years' acquaintance with the region, he was certain had not been visible during that period.
As in the case of Hyginus N, there are still many sceptics as regards actual change, despite the records of Lohrmann and Madler; but the evidence in favour of it seems to preponderate. CONON. A bright little crater, 11 miles in diameter, situated among the intricacies of the Apennines, S. of Mount Bradley. It has a central hill, which is not a difficult object.
The study of archaeology, both on its linguistic and material sides, was carried on in the Augustan age with great vigour, though no single name is comparable to that of Varro for extent and variety of research. One of the most eminent and copious writers on these subjects was Gaius Julius Hyginus, a Spanish freed man of Augustus, who made him principal keeper of the Palatine library.
It remained in obscurity until two hundred years ago, when it was discovered in a library at Rheims. HYGINUS is said to have been a native of Alexandria, or, according to others, a Spaniard. He was, like Phaedrus, a freedman of Augustus; but, though industrious, he seems not to have improved himself so much as his companion, in the art of composition.
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