M. TECHNOLOGY. 597 



yellow prussiate of potash, according to Gelis, and of sulpho- 

 cyanide of ammoniimi for the fabrication of the toys called 

 Pharaoh's serpents. Y. For the preparation of the Fenian or 

 liquid fire a solution of phosphorus in bisulphide of carbon, 

 with which projectiles for rifled guns are flUed. 8. In silver- 

 plating, a small quantity of bisulphide of carbon is added to 

 the silver-bath, so that a brilliant deposit may at once be ef- 

 fected. 9. For killing rats, mice, moths, ground worms, and 

 other vermin. 10. As a motor for steam-engines. All sys- 

 tems of engines, with or without expansion, can be run with 

 bisulphide of carbon, which, as is well known, boils at 115 

 Fahr. The construction requires no essential alteration ; but, 

 since bisulphide of carbon dissolves fat and oil with ease, 

 water must be nsed for lubricating. 



One real objection to the use of bisulphide of carbon is its 

 extremely disagreeable odor. This, however, can be removed 

 in a great measure by certain forms of treatment ; although 

 involving a considerable increase of the cost, it is less desir- 

 able in many cases. Dr. Yohl, of Cologne, maintains that 

 gasoline is applicable to nearly all the purposes for which bi- 

 sulphide of carbon is used ; and, besides being much cheaper, 

 is free from many of its defects and dangers. 17 A^3Iay 1, 

 1873,67. 



BISULPHIDE OF CAKBON FOR SCOURING WOOL. 



According to Jean de Hall, bisulphide of carbon presents 

 no special advantages for freeing wool from grease. It has 

 no injurious effect on the wool at from 50 to 59, and if it 

 is removed after extraction of the grease by a current of 

 cold air, the wool will be soft, and not distinguishable from 

 that scoured by benzole. But the separation of the bisulphide 

 of carbon by a current of cold air is too slow, and too waste- 

 ful of that substance to be practicable on a large scale ; 

 and if steam or warm dry air be employed for the purpose, 

 the increased temperature renders the wool containing bisul- 

 phide less soft and pliable, as clearly manifest in its feel. 

 Furthermore, although it preserves its color during the op- 

 eration, it becomes yellow shortly afterward in comparison 

 with a sample treated by benzole a change that can not be 

 explained, except as indicating a chemical decomposition in 

 the wool fibres, since the color can not be removed by any 



