. Bulletin der US-Landwirtschaft. Landwirtschaft Die Landwirtschaft. 26 BULLETIN" 314 vom US-Landwirtschaftsministerium. 2 Spritzflaschen; 1 für Lösungsmittel, 1 für Wasser. 1 Bunsenbrenner. 1 nichrom Dreieck. 1 Bügeleisen Stativ. 1 Trockenofen. 1. Exsikkator mit calciumchlorid. 1 Thermometer Lesen von - 10°C bis 110°G.1 Vakuumpumpe und Verbindungen. 1. Analysenwaage, Kapazität 100 Gramm, empfindlich auf 0,1 Milligramm. Dieser Test besteht in der Auflösung des Bitumen in Schwefelkohlenstoff und Wiederherstellung unlösliche Substanzen durch Filterung der Lösung durch eine Asbest fühlte. Die Form von Gooch c

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. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. 26 BULLETIN" 314, U. S. DEPARTMENT OF AGRICULTURE. 2 wash bottles; 1 for solvent, 1 for water. 1 Bunsen burner. 1 nichrome triangle. 1 iron tripod. 1 drying oven. 1 desiccator with calcium chloride. 1 thermometer reading from —10° C. to 110° G. 1 vacuum pump and connections. 1 analytical balance, capacity 100 grams, sensitive to 0.1 milligram. This test consists in dissolving the bitumen in carbon disulphide and recovering any insoluble matter by filtering the solution through an asbestos felt. The form of Gooch crucible best adapted for the determination is 4.4 centimeters wide at the top, tapering to 3.6 centimeters at the bottom, and is 2, 5 centimeters deep. For preparing the felt the necessary apparatus is arranged as shown in figure 14, in which a is the filtering flask, & a rubber stopper, c the filter tube, and d a section of rubber tubing which tightly clasps the Gooch crucible e. The asbes- tos is out with scissors into pieces not exceeding 1 centimeter in length, after which it is shaken up with just suffi- cient water to pour easily. The cruci- ble is filled with the suspended asbestos, which is allowed to settle for a few mo- ments. A light suction is then applied to draw off all the water and leave a firm mat of asbestos in the crucible. More of the suspended material is added, and the operation is repeated until the felt is so dense that it scarcely transmits light when held so that the bottom of the crucible is between the eye and the source of light. The felt should then be washed several times with water, and drawn firmly against the bottom of the crucible by an increased suc- tion. The crucible is removed to a drying oven for a few minutes, after which it is ignited at red heat over a Bunsen burner, cooled in a desiccator and weighed. From 1 to 2 grams of bitumen or about 10 grams of an asphalt topping or rock asphalt is now placed in the Erlenmeyer flask, whic

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