K. DOMESTIC AND HOUSEHOLD ECONOMY. 489 



two hundred pounds of water, and thirty-five pounds of lime, 

 as milk of lime. The cheap, thick, residual oils, from the 

 manufacture of paraffine, can be improved as lubricants by 

 thickening them, by melting them with lead-soap. Mixtures 

 of petroleum, rosin-oil, and resin-soap are frequently used as 

 lubricants, as well as glycerine. 18 (7, January 29, 1873, 79. 



FILTER OF SPUN GLASS. 



According to Weiskopf, a filter, giving very clean filtrates 

 with great rapidity, may be made by felting extremely fine 

 filaments of spun glass, and employing them in the same 

 manner as asbestos. 



KEEPING LEATHER HARNESS PLIABLE. 



It is well known that leather articles kept in stables soon 

 become brittle in consequence of ammoniacal exhalations, 

 which affect both harness hanging up in such localities and 

 the shoes of those who frequent them. The usual applica- 

 tions of grease are not always sufficient to meet this diffi- 

 culty ; but it is said that by adding to them a small quantity 

 of glycerine the leather will be kept continually in a soft and 

 pliable condition. 13 (7, September 15, 1872, 1239. 



PITCHING COMPOUND FOR WOODEN VESSELS. 



The following preparation has been patented by Werner, 

 of Mannheim : Two and a half pounds of the best Courie 

 copal is washed, powdered, dried on copper gauze or gal- 

 vanized sheet -iron, and dissolved in one and a half pounds 

 of concentrated sulphuric ether, and then diluted with ten 

 pounds of rectified alcohol. The solution is then mixed with 

 fifty pounds of alcohol, ten and a half pounds of seed lac, 

 one third of a pound of spermaceti, a quarter of a pound of 

 glycerine, a quarter of a pound of wax, and one pound of 

 Venetian turpentine, and distilled in an apparatus having a 

 worm. 6 (7, October 31, 1872, 438. 



HAIR ERADICATOR. 



Professor Buttger recommends hydrated sulphuret of so- 

 dium as an extremely efficient and perfectly inodorous hair 

 eradicator, and as being much more effective in this respect 

 than hvdrated sulphuret of calcium, previously recommend- 



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