570 TRANSACTIONS OF THE AMERICAN INSTITUTE. 



presents, are points on which it differs, essentially from the red, blue and 

 violet, of aniline. Mr. Lautli's process consists in printing, witli the mix- 

 ture of hydrochlorate of aniline and chloride of potassium, an insoluble 

 oxidisable salt, which will become soluble on the fabric, sulphide of copper 

 for example. B3' the oxidizing action of the chloric acid (or the chlorine 

 which is set free by the reaction of hj'drochlorate of aniline on the chlorate 

 of potassium,) the sulphide of copper is transformed into sulphate. The 

 color is very permanent, and is fixed at from 20'' to 40*^ C. and its compo- 

 position allows of its being printed with all sorts of colors. Aniline black 

 has a very rich velvety appearance. It is insoluble in water, alkaline or 

 acid, and is unaffected by soap. Acids change the black to green, but the 

 original color is restored by an alkali. 



Removal of Bisulphide of Carbon from Gas. 



Mr. Lewis Thompson has published a simple process for purifying gas 

 from bisulphide of carbon, based on the fact that the vapor of water and 

 the bisulphide cannot exist together at a red heat; mutual decomposition 

 taking place with the formation of sulphuretted hj'drogen and carbonic 

 acid. The gas as it leaves the main, is mixed with a certain portion of 

 steam, and passed through a tube heated to a cherry red having a length 

 proportioned to the velocity of the current, so that the whole gases will be 

 heated before they leave the tube. The sulphureted hydrogen and carbonic 

 acid, are refnoved by the usual processes for purifying gas. 



New Bituminous Substance from Brazil. 



Prof. Archer submitted to the Royal Society of Scotland, an anal3'sis of 

 a substance under the name of coal, from Brazil, -which showed that it con- 

 tained a much larger percentage of oil than any bituminous coal in Great 

 Britain. It had little of the appearance of coal, but seemed to be an indu- 

 rated claj'. It was very light, extremely buoyant in water and extremely 

 inflamable, burning at a low temperature. From this description, we may 

 conclude that this substance does not differ essentially from similar forma- 

 tions which have been exhibited to this Association. 



Separation of the Cotton and Wool in Mixed Woolen 



Fabrics. 



Most of our readers are aware that the wool can be recovered from woolen 

 rags, and worked up again into articles which, if not equal to those into 

 which it was originally manufactured, are yet of great utility. In the same 

 way cotton and linen rags may be utilized in the manufacture of paper, &c. ; 

 but the rags of mixed fabrics are of but little value, and can scarcely be 

 used at all without the destruction of one of the constituents, so as to leave 

 the otheras unmixed as possible. This is of course a waste to be regret- 

 ted, especially at a time when the scarcity of cotton presses hardly on pa- 

 per manufacturers. A process has, however, been recently invented in 

 France, by means of which the flax or cotton can be separated for the use 

 of the paper manufacturer, and the wool for that of the manufacture of 

 prussiate of potash, or Prussian blue, or for the use of the agriculturist as 

 manure. It appears that it is particularly valuable as manure, since it is 



