was an extraordinary reptile, of gigantic size, the length of whose neck exceeded that of its body and tail.  It had ribs like a chameleon, and the body of a whale:  it chiefly inhabited the water; but as the visitor will find the chief types of these extraordinary extinct reptiles in the next room, he may at once, with the comfortable assurance that the Weald of Kent yields nothing in the present day like the wealden lizard, turn to the table cases of the room, in which he-will find further varieties of

Minerals.

The southern range of tables is numbered from 14 to 23; and the northern range from 38 to 47.  The first three tables of the southern range (14-16) are covered with the varieties of Oxides of Iron, including magnetic iron ore; natural magnets; the salam-stell of the East Indies; iron glance from Elba, Vesuvius, and Stromboli, some of which are very beautiful; brown iron stones, including the variety used as hair powder by natives of South Africa; and the pea ores that fell in a shower, on the 10th of August, 1841, in Hungary.  In the next case (17) are the Oxides of Copper; bismuth; red oxide of zinc; cobalt ochres; oxide of uranium; and pitch ore.  In the nineteenth case are the Oxides of Lead; and in the twentieth are the first of the oxides of electro-negative substances.  This case contains the valuable alumina known as noble corundite, and to jewellers in its formations of ruby, sapphire, and the oriental emerald, topaz, and amethyst.  Herein also is the kind of corundum known as emery, and esteemed for its polishing properties.  In this case also are the Aluminates of Magnesia, including the sapphirine; the chrysoberyls from Brazil, and those inclosed in quartz and felspar with garnets.  The next four cases (20-23) are loaded with the varieties of the Acid of Silicium or silica, which constitutes the greater part of hard stones and minerals with which the earth is encrusted.  It is nearly pure in the rock crystal, of which there are many specimens in the first case (20), including those crystals called Bristol and Gibraltar diamonds, cairngorms, the smoky topaz; rock crystals inclosing foreign substances, and in a wrought state:  of these Dr. Dee’s snow-stone is one.  The next two cases (21, 22) are devoted to the varieties of common quartz, including the flexible sandstones of Brazil (of which there are some larger specimens upon a separate table) and to those of the east; milk quartz; the Salzburg blue quartz, &c.; some varieties of the cat’s eye; hornstones, including wood changed into hornstone:  and herein begin the flints, including some specimens changing into calcedony, smalt blue calcedony from Transylvania; the Icelandic stalactical calcedony; and the fine Cornish calcedony.  Upon the last southern table (23) are ranged further varieties of calcedony.  These include the blood stone; the curious Mocha stones; and agates, including the agate nodule from central Asia.  Having sufficiently examined these beautiful varieties of calcedony, the visitor should pass at once to the northern range of tables.