. India rubber world. ning alundum,and after the acetone and the ethyl acetate have been expelledby warming the boat for several hours in the drying oventhe nitrosite is burned in a current of oxygen, and the carbondioxide formed is absorbed in soda lime and weighed. The method proposed is to grind a sample to 20 Mesh ifpossible and weigh out Vz gram and extract with acetone in aWiley or Cottle extractor. Transfer to a 50 flask anddissolve or swell in 40 of chloroform. Nitrogen trioxideis made from arsenic trioxide with sp. gr. nitric acid, andthis is passed through the rubber so
. India rubber world. ning alundum,and after the acetone and the ethyl acetate have been expelledby warming the boat for several hours in the drying oventhe nitrosite is burned in a current of oxygen, and the carbondioxide formed is absorbed in soda lime and weighed. The method proposed is to grind a sample to 20 Mesh ifpossible and weigh out Vz gram and extract with acetone in aWiley or Cottle extractor. Transfer to a 50 flask anddissolve or swell in 40 of chloroform. Nitrogen trioxideis made from arsenic trioxide with sp. gr. nitric acid, andthis is passed through the rubber solution in chloroform keptcool by immersing the flask in water. .A deep green color showswhen enough has been used. Filter the chloroform solution through a gooch and wash withchloroform and place the asbestos mat with nitrosite in a 75 , dissolve in acetone and pour into the original graduatedflask, make up to mark and settle and take out 25 , andput in criynniyer and evaporate to small bulk and pour into. Apparatus kor thb Direct Dbtsrminati TRADE FACILITATED BY NEW SHIPPING BILL. With the passage of the new shipping bill the fleet of freightvessels owned by W. R. Grace & Co., importers, numbering tenand having a total tonnage of tons, will be operated un-der the American flag. Most of these vessels are now in theSouth .\merican trade, while four more are being built for thecompany for the Panama canal trade. It is also expected thatthe Standard Oil Co., now a fleet of 70 tank steamers, and theUnited Fruit Co. with 25 vessels floating the British flag, willjoin the .Xmerican shipping contingent as soon as the necessarysteps can be taken. ON OP Rubber by thb Combustion Method a small boat two-lhirus full of alundum. Rinse with ethylacetate, dry and place in the combustion tube. As shown by the illustration herewith, the combustion tube isa Morse and Taylor tube with an electrically heated platinumspiral wire for a catalyzer. This is heated electrically by a
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