_Serial No. 592._--Sample of canned pineapples, bought of Mr. Brown, Fifth Avenue, August 4, 1890. Labeled: Pineapples, First Quality. Packed by Martin Wagner & Co., Baltimore, Md. Per Cent. Tin dioxide 0.0098 Grains per pound 0.6860 Equivalent to stannous chloride 0.8640 Minimum doses 13.6 Maximum doses 1.7 Can eroded _Serial No. 593._--Sample of canned pineapples, bought of Mr. Brown, Fifth Avenue, August 4, 1890. Labeled: Florida Pineapple, Oval Brand. Extra Quality. A Booth Packing Co., Baltimore, Md. Per Cent. Tin dioxide 0.0158 Grains per pound 1.11 Equivalent to stannous chloride 1.40 Minimum doses 22.40 Maximum doses 2.80 Can eroded. --_Jour. Amer. Chem. Soc_. * * * * * NEW PROCESS FOR THE MANUFACTURE OF CHROMATES. By J. MASSIGNON and E. VATEL. The ordinary method of manufacturing the bichromates consists in making an intimate mixture of finely pulverized chrome ore, lime in large excess, potash or soda, or corresponding salts of these two bases. This mixture is placed in a reverberatory furnace, and subjected to a high temperature, while plenty of air is supplied. During the operation the mass is constantly puddled to bring all the particles into contact with the hot air, so that all the sesquioxide of chromium of the ore will be oxidized. After the oxidation is finished, the mass is taken from the furnace and cooled; the bichromate is obtained by lixiviation, treated with sulphuric acid and crystallized. This method of manufacture has several serious objections. The authors, after research and experiment, have devised a new process, following an idea suggested by Pelouze.