432 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



though while the skin remains perfectly sound no evil effect 

 will be produced by contact. A stone vessel is to be select- 

 ed, in which a small quantity of cyanide of potassium is to be 

 introduced, and hot water poured upon it, so as to make a so- 

 lution of one half to one degree B. Care must be taken not 

 to inhale any of the vapor of the solution. The whole is to 

 be stirred well with a long and strong glass rod, and the op- 

 eration must be conducted in the open air, so that no harm 

 may result from the condensation of the vapor. The fabric 

 in question, previously well cleaned, is now placed in the ves- 

 sel, and pushed under the liquid with the glass rod, and the 

 top of the vessel laid on. 



It will be advisable to adopt some method to keep the so- 

 lution warm, such as immersing the stone vessel in a wooden 

 tub properly supplied with steam or hot water. Should the 

 vessel crack and the liquid leak out, it would in this instance 

 become diluted with the surrounding water, and thus be less 

 dangerous. After a short time the lid should be removed by 

 taking it' off at the end of a long handle, allowing the vapors 

 to pass off before the operator comes near. By means of the 

 glass rod the cloth is to be lifted, and if not entirely white, is 

 to be replaced and the process continued still longer. When 

 finished, the cloth is to be transferred by means of the glass 

 rod to a large vessel containing hot water, and stirred around 

 for a time, then removed and rinsed off. The solution of the 

 cyanide of potassium can be used several times without losing 

 its power, especially if a solution of sulphate of iron be stirred 

 in occasionally, producing a deposit of Berlin blue. 



We give only an abstract of the article of Dr. Reimann, re- 

 ferring our reader to the original for further details. Through- 

 out the whole paper injunctions are continually laid upon 

 operators to avoid very carefully the inhaling of the fumes 

 of the solution, or touching it in any way except through the 

 intervention of the glass rod. 24 C, xxiv., 185 ; xxv., 194. 



COMBINATIONS OF W T OLFRAM OR TUNGSTEN. 



It is well known that wolfram or tungsten at one time was 

 considered as a great nuisance by the miner, and many ores 

 containing otherwise valuable metals were abandoned in con- 

 sequence of the supposed disadvantage of the combination. 

 Lately, however, this metal has become of economical impor- 





