HERR GROTOWSKY, of Halle, on the Saale, has made known some interesting facts on a new property of hydrocarbon oils which he has discovered. Exposing various kinds of oils in glass flasks to the rays of the sun for a period of three months he found invariably that they absorbed oxygen and converted it into ozone. The air was ozonized even in well corked vessels, the effect being, however, to some degree dependent upon the color of the glass. The respective results were noted after the lapse of three months. American kerosene, from petroleum, which had been exposed to light in white unwraped glass balloons, had become strongly ozonized so much so that it scarcely burned. The originally bluish white oil had, assumed a vivid yellow color, and the specific gravity was found to have increased 0005. American kerosene which had been kept in the dark for three months did not show any ozone at all, and burned . satisfactorily. The oils were exposed from April to July, 1868. Those which had become strongly ozonized had also suffered a' distinct change in odor, and the corks were bleached as if attacked by chlorine, while the other oils had remained unchanged in these particulars.. THE JEFECT OF CHABCOAL ON FLOWERS.—A horticulturist in England, purchased a rose bush full of promising budi the flowers, however, were of a faded hue. He covered the earth in the pot about an inch thick with pulverized charcoal, and was surprised, some days afterward, to find the blooms of a fine lively rose color. He repeated the experiment anot \ev season with the same result. He then tried the powdered charcoal upon petunias, and found that both the white and violet colored flowers were equally sensitive to its action. It always gave great vigor to the red or violet colors of the flowers, and the white petunias became veined with red or violet tints ; the violets became covered with irregular spots of a bluish or almost black tint. Many persons who admired them thought they were choice new varieties from the seed. Yellow flowers appear to beinsensible to theinfluence of charcoal. THE new Cab Company Act, which passed the Legislature during the last session, is shortly to go into operation. The company have a capital of a quarter of a million, with power to add one hundred and fifty thousand more, and are authorized to run their cabs or hansoms in any street in New York or Brooklyn that the Mayor of each city may direct. The following rates of fare are provided in the act, and a half fare additional may be demanded between midnight and six o'clock in the morning : " For any distance not exceeding one mile, for a single passenger, 30 cents, and for two persons, 40 cents; and at the same rate for greater distances, a fraction of a mile counting always as a mile. For any time not ex. ceeding one hour, for a single passenger, 75 cents; for two persons, $1; and for any time additional, for each hour, or fractional part of an hour, at the same rate." CHEAP POSTAGE SYSTEM.—Since the publication on page 315, current volume, of our notice of the abuse of the franking privilege by Hon. John T. Deweese, M. C, of North Car olina, in franking Swetland's circulars, we have had other complaints. It appears from the envelopes before ua that Mr. Deweese not only signs his frank, but the superscription appears also to be done in the same hand writing. We could afford to pay a very liberal salary to any " M. C." who is open to do work of that sort. Our yearly postage bills are very large. DWARF orange trees from China have reached Los Angeles, California, in good condition. " It is curious," says a writer, " to see an orange tree not over two feet high, and filled with blossoms and fruit." An acre of ground would contain over four thousand of such trees, and although each tree would produce not more than a half dozen oranges, yet the yield per acre would largely overbalance that of standard trees. A lot of bamboo plants, of a variety which grows to a hight of thirty feet, and from three to four inches in diameter, have also reached California. THE PostofEce* Department has received a telegram from Promontory Point, stating that the mails have been delivered at that place to the Central Pacific Road, and that the through line has been regularly established. The Butterfield Company were informed that their contract would cease on the junction of the roads. The cost by the Butterfield route for transporting the mails was $1,100 a mile, and by the railroad $200 a mile per annum. WE desire to call the attention of our readers to the advertisement of the Colwells, Shaw & Willard Manufacturing Company, dealers in Patent Lead Encased Block-tin Pipe, published in another column. This pipe brings one of the purest and most harmless of metals into contact with water used for culinary purposes, instead of the poisonous metal-lead. Its merits are attested by a large number of eminent scientific and practical men. FISH.—William Church, of Seymour, Conn., is engaged in pisciculture, and estimates that his present stock in trade consists of 500 trout, which will weigh from 1J to 1 pounds each ; 5,000 which will weigh 1 pound each ; 20,000 which will weigh from 8 to 10 ounces, and 100,000 which will weigh from 2 to 4 ounces. In three years' time he thinks he will be able to send to market 200 tuns per annum. IHngler's Journal recommends as a lute for covering the corks of vessels containing benzine or any of the light hydrocarbons or essential oils, a paste made of finely-ground litharge and concentrated glycerin. The mixture is spread over the corks or bungs, and soon hardens. It is insoluble in the said liquids, is not acted upo.i by them, and is quite inexpensive, as the commonest kind of glycerin can be used. REPORT ON HEAVY ORDNANCE.—We are indebted to tke courtesy of Hon. J. A. Gtarfield fora copy of the Report of ihe Joint Committee on Ordanance, presented to the IT. S. Senate, February 15, 1869, for which he will please accept thanks. The notice of the subject-matter of this report is reserved fo? a future occasion. WE, this week, conclude our series of articles on t216 manufacture of beet root sugar. They comprise the pzost copious and reliable information ever published in America on this industry, and may take the place of a hand-book with manufacturers and others who wish to be informed in regard to it. PAGLIARI, an Italian chemist, has invented a kind of paper with which carbolic acid is so thoroughly incorporated that the paper when used to pack animal substances preserves them in a perfectly fresh state, without salt or any curing whatever.