M. TECHNOLOGY. 507 



other compositions. Borate of manganese was brought into 

 use as a dryer, in England, about six months ago, and has 

 recently been introduced into this country. 



GLYCERINE FOR LEATHER. 



It is stated that glycerine adds greatly to the elasticity 

 and strength of leather, and that hides, especially those to 

 be cut into leather bands for machinery, may be greatly im- 

 proved by being soaked for some time in this substance. 

 1 A, June 21, 1872, 300. 



PETROLEUM FOR PEGGED SHOES. 



If pegged boots are occasionally dressed with petroleum 

 between the soles and upper leather they will not rip. If 

 the soles of boots and shoes are dressed with petroleum they 

 will resist wet and wear well. The pegs, it is said, are not 

 affected by dryness after being well saturated with the liquid. 

 18 A, June 14, 1872, 336. 



IMPROVED COMPOSITION FOR PAINT. 



The peeling off of paint from surfaces, it is stated, may be 

 prevented by using a solution of wax and turpentine with 

 the paint, as well as linseed oil. Five pounds of yellow wax 

 are to be dissolved in five pounds of linseed oil, and two and 

 a half pounds of resin are to be dissolved in four pounds of 

 turpentine, and the two solutions are then mixed. This is 

 thinned by means of a little oil of turpentine, and about one 

 third part of any given color is to be stirred in. Even with- 

 out any coloring matter the mixture can be used for various 

 purposes, as it is almost entirely colorless, and well replaces 

 the priming in wax and fresco painting. Mitth. fur den 

 Gewerbeverein fur Nassau, 1871, 28. 



CARBOLATE OF SODA. 



The best substance for preserving paste, starch-finish, etc., 

 from putrefaction or change, is stated to be carbolate of soda, 

 this having many advantages over carbolic acid in the way 

 of efficiency and permanence. This salt is easily prepared 

 by dissolving the common carbolic acid in caustic soda lye 

 until the acid is no longer taken up, but swims in the form 

 of oily drops upon the surface of the liquid. Of this solution 



