These are now of great value as a contribution to the knowledge of Grecian-Egyptian antiquity, which has been industriously cultivated on several sides. We have also made another collection of the numerous so-called “Inscriptions of Sinai” which were cut into the rocks by a Christian population who lived on the Peninsula of Sinai in the first centuries of our era. These have not yet been entirely deciphered. We have only been able to give occasional attention to subjects pertaining to natural science. Yet I have not neglected to collect specimens of stone and soil from all important localities, especially during trips into the remote mountain regions. A chemical investigation and comparison of the specimens of Nile mud collected from different spots and under different conditions will perhaps be of interest. We have visited the old alabaster quarry of El Bosra, opposite Sioot, which has recently been discovered by the Bedouins and is now worked by Selim Pasha. We found there an inscription on the rock dating from the beginning of the eighteenth dynasty. We have also visited the quarries of granite and of “_breccia verde_” at Hammamât, which have been in use since the most ancient times, as well as the porphyry and granite quarries on Gebel Duchàn (Mons Claudianus, Mons Porphyrites,) in the eastern mountains of Egypt, (see page 160) which were celebrated in Roman times. We have brought back specimens of rock from them all. The most valuable blocks of “_breccia verde_,” of every size, lie directly on one of the finest and most convenient desert highways, two days journey from the Nile, and would be excellently adapted to removal and exportation. On account of our antiquarian aims we were especially interested in the opportunity of becoming acquainted with the present world of animals and plants in the southern regions of Nubia, which conspicuously resembles the representations on the most ancient Egyptian monuments. It scarcely appears possible to account for this except by the assumption of a universal recession of the more highly developed forms of natural life in the Nile valley from the north towards the south. INDEX TO THE WORKS OF RICHARD LEPSIUS. I. _De tabulis Eugubinis. Diss. philologica. Berolini_, 1833. 8. II. _L’ami au vainqueur, oenochoé_ (οἰνοχοή) _à inscriptions. Annales de l’Institut de corr. arch._ 1833. V. p. 357-363. III. _Palaeographie als Mittel für die Sprachforschung zunächst am Sanskrit nachgewiesen._ [Palaeography as a Means of Philological Research, with Special Reference to Sanskrit.] Berl. 1834. 8. IV. _Über die_ πρῶτα στοιχεῖα _in der Stelle bei Clemens Alexandrinus über die Schrift der Aegypter_. [On the πρῶτα στοιχεῖα in the Passage from Clemens Alexandrinus on the Writing of the Egyptians.] _Aus d. N.-Rhein. Museum für Philologie_, 1835. Vol. IV. p. 142-148. 8.