K. DOMESTIC ECONOMY. 471 



ammonia;, the mixture must then be well stirred, and the 

 linen steeped in it for two or three hours, taking care to cover 

 up the vessel which contains it as nearly hermetically as pos- 

 sible. The clothes are afterward washed out and rinsed in 

 the usual way. The soap and water may be reheated and 

 used a second time, but in that case half a tablespoonful of 

 turpentine and a tablespoonful of ammonia are to be added. 

 The process is said to cause a great economy of time, labor, 

 and fuel. The linen scarcely suffers at all, as there is little 

 necessity for rubbing, and its cleanliness and color are per- 

 fect. The ammonia and turpentine, although their detersive 

 action is great, have no injurious effect upon the linen; and 

 while the former evaporates immediately, the smell of the 

 latter is said to disappear entirely during the drying of the 

 clothes. 18 A, April 26, 1872, 143. 



REMOVAL OF PERSPIRATION. 



Woolen undergarments when saturated with perspiration 

 do not wash well in soap-suds, the lactic and acetic acid of 

 the perspiration decomposing the soap, and an unpleasant 

 fatty odor remaining in the fibre. To obviate this incon- 

 venience, Professor Artus recommends the use of warm soda 

 lye for soaking, and a subsequent washing in warm water, 

 to which some ammonia has been added. 6 C, June, 1872, 

 192. 



METHOD OF REPRODUCING DRAAVINGS. 



Mr. Renault announces a new process for reproducing 

 drawings, which consists in tracing a design upon a stout 

 and rather polished sheet of paper with a gummy ink, over 

 which is to be shaken a metallic powder like the bronze pow- 

 der of the arts. In this way a kind of plate is obtained, by 

 means of which the drawing can be transferred to sensitized 

 paper, this being colored black by the pulverulent metal. 

 G B.May 27, 1872,1412. 



METHOD OF EMPTYING A BOTTLE RAPIDLY. 



According to the Chemical News, an inverted bottle can 

 be emptied very rapidly by imparting a motion of rotation 

 to its contents, the liquid issuing in the form of a tube, and 

 the air entering up the centre without impeding the passage 



