A fire-engine station is located at within twelve or fifteen feet of the exhibition building. A committee composed of competent jewelers and mineralogists has been appointed to make an appraisement of the diamonds and to indicate such as should be withheld from sale on account of their scientific, artistic, or historic interest. The members of the committee propose to preserve the following objects: 1. The "Regent" (Fig. 2), by reason of its mineralogical value, the perfection of its cutting, the purity of its water, its incomparable luster, and its great size, it being the largest brilliant as yet known. 2. The military sword of Charles the Tenth's coronation, the hilt of which is entirely of brilliants mounted by Bapst with wonderful art. 3. The jewel called the "Reliquary," of the 15th century. To these riches must be added the following interesting objects: the Dey of Algiers' watch; the Elephant of Denmark; the decorations, etc., of foreign orders; crowns and diadems of sapphire; rubies; pearls that afford curious specimens of French art at the beginning of our century; one of the Mazarins bequeathed by the celebrated Cardinal; and lots of colored stones destined for our national museums. The same exhibition alluded to above contains a number of other collections of great interest that it would be unjust to pass over in silence, such as the exhibit of the French diamond mines of the Cape, where one may see all the details of this prosperous exploitation by means of photographs and specimens. The art bronzes, the objects of jewelry, of goldsmith's work, and of morocco work, the music boxes, Trouve's and Aboilard's electric jewelry, and the retrospective art collections especially attracted the attention of the public.--_La Nature._ * * * * * A NEW MODE OF TESTING THE ECONOMY OF THE EXPENSES OF MANAGEMENT IN LIFE INSURANCE. How to determine the general ratios of the expenses of management of life insurance companies has hitherto been an unsettled question, and I think no serious attempt has been made before my own to study this question exhaustively, and reach a scientific conclusion. Believing that, one is contained in the following statement, I respectfully submit it to the criticism of others.