The mining interests, too, were prospering, and improvements on the ancient Spanish system were sought to be introduced, through the instrumentality of eleven German miners whose services had been engaged by the home government in Dresden, through its envoy Don Luis Orcis. These personages presented themselves in New Spain with the pompous title of practical professors of mineralogy, but they were altogether unskilled in the actual working of mines, and unable to render those of Mexico more productive. The only benefit derived from this mineralogical mission was the establishment of a course of chemical lectures in the seminary of mines, under the direction of Lewis Leinder, who set up the first laboratory in Mexico. * * * * * On the 23d of December, 1788, the minister of the Indies apprised the viceroy of the death of Charles III., which had occurred in the middle of that month. Funeral ceremonies were celebrated, with great pomp, in Mexico, in honor of the defunct monarch; and, on the 22d of February, 1789, the resignation of the viceroyalty by Flores,--who desired heartily to retire from public life--was graciously accepted by the Spanish court, and his successor named, in the person of the second Count Revilla-Gigedo. THE COUNT DE REVILLA-GIGEDO--THE SECOND, LII. VICEROY OF NEW SPAIN. 1789-1794. This distinguished nobleman, whose name figures so favorably in the annals of Mexico, reached Guadalupe on the 16th of October 1789, and on the following day entered the capital with all the pompous ceremonies usual in New Spain upon the advent of a new ruler. In the following month--the new sovereign Charles IV. was proclaimed; and the viceroy, at once set about the regulation of the municipal police of his capital which seems to have been somewhat relaxed since the days of his dreaded and avaricious father. Assassinations of the most scandalous and daring character, had recently warned the viceroy of the insecurity of life and property even in the midst of his guards. But Revilla-Gigedo possessed some of the sterner qualities that distinguished his parent, and never rested until the guilty parties were discovered and brought to prompt and signal justice. The capital soon exhibited a different aspect under his just and rigorous government. He did not trust alone to the reports of his agents in order to satisfy his mind in regard to the wants of Mexico; for he visited every quarter of the city personally, and often descended unexpectedly upon his officers when they least expected a visit from such a personage. The poor as well as the rich received his paternal notice. He enquired into their wants and studied their interests. One of his most beneficent schemes was the erection of a Monte Pio, for their relief, yet the sum he destined for this object was withheld by the court and used for the payment of royal debts. Agriculture, horticulture and botany were especially fostered by this enlightened nobleman.